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Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull locking updates from Ingo Molnar:
 "The main changes in this cycle are:

   - rwsem scalability improvements, phase #2, by Waiman Long, which are
     rather impressive:

       "On a 2-socket 40-core 80-thread Skylake system with 40 reader
        and writer locking threads, the min/mean/max locking operations
        done in a 5-second testing window before the patchset were:

         40 readers, Iterations Min/Mean/Max = 1,807/1,808/1,810
         40 writers, Iterations Min/Mean/Max = 1,807/50,344/151,255

        After the patchset, they became:

         40 readers, Iterations Min/Mean/Max = 30,057/31,359/32,741
         40 writers, Iterations Min/Mean/Max = 94,466/95,845/97,098"

     There's a lot of changes to the locking implementation that makes
     it similar to qrwlock, including owner handoff for more fair
     locking.

     Another microbenchmark shows how across the spectrum the
     improvements are:

       "With a locking microbenchmark running on 5.1 based kernel, the
        total locking rates (in kops/s) on a 2-socket Skylake system
        with equal numbers of readers and writers (mixed) before and
        after this patchset were:

        # of Threads   Before Patch      After Patch
        ------------   ------------      -----------
             2            2,618             4,193
             4            1,202             3,726
             8              802             3,622
            16              729             3,359
            32              319             2,826
            64              102             2,744"

     The changes are extensive and the patch-set has been through
     several iterations addressing various locking workloads. There
     might be more regressions, but unless they are pathological I
     believe we want to use this new implementation as the baseline
     going forward.

   - jump-label optimizations by Daniel Bristot de Oliveira: the primary
     motivation was to remove IPI disturbance of isolated RT-workload
     CPUs, which resulted in the implementation of batched jump-label
     updates. Beyond the improvement of the real-time characteristics
     kernel, in one test this patchset improved static key update
     overhead from 57 msecs to just 1.4 msecs - which is a nice speedup
     as well.

   - atomic64_t cross-arch type cleanups by Mark Rutland: over the last
     ~10 years of atomic64_t existence the various types used by the
     APIs only had to be self-consistent within each architecture -
     which means they became wildly inconsistent across architectures.
     Mark puts and end to this by reworking all the atomic64
     implementations to use 's64' as the base type for atomic64_t, and
     to ensure that this type is consistently used for parameters and
     return values in the API, avoiding further problems in this area.

   - A large set of small improvements to lockdep by Yuyang Du: type
     cleanups, output cleanups, function return type and othr cleanups
     all around the place.

   - A set of percpu ops cleanups and fixes by Peter Zijlstra.

   - Misc other changes - please see the Git log for more details"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (82 commits)
  locking/lockdep: increase size of counters for lockdep statistics
  locking/atomics: Use sed(1) instead of non-standard head(1) option
  locking/lockdep: Move mark_lock() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING
  x86/jump_label: Make tp_vec_nr static
  x86/percpu: Optimize raw_cpu_xchg()
  x86/percpu, sched/fair: Avoid local_clock()
  x86/percpu, x86/irq: Relax {set,get}_irq_regs()
  x86/percpu: Relax smp_processor_id()
  x86/percpu: Differentiate this_cpu_{}() and __this_cpu_{}()
  locking/rwsem: Guard against making count negative
  locking/rwsem: Adaptive disabling of reader optimistic spinning
  locking/rwsem: Enable time-based spinning on reader-owned rwsem
  locking/rwsem: Make rwsem->owner an atomic_long_t
  locking/rwsem: Enable readers spinning on writer
  locking/rwsem: Clarify usage of owner's nonspinaable bit
  locking/rwsem: Wake up almost all readers in wait queue
  locking/rwsem: More optimal RT task handling of null owner
  locking/rwsem: Always release wait_lock before waking up tasks
  locking/rwsem: Implement lock handoff to prevent lock starvation
  locking/rwsem: Make rwsem_spin_on_owner() return owner state
  ...
alistair/sunxi64-5.4-dsi
Linus Torvalds 2019-07-08 16:12:03 -07:00
parent 46f1ec23a4 9156e54576
commit e192832869
55 changed files with 2785 additions and 2017 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/atomic_t.txt
View File

@ -81,9 +81,11 @@ Non-RMW ops:
The non-RMW ops are (typically) regular LOADs and STOREs and are canonically
implemented using READ_ONCE(), WRITE_ONCE(), smp_load_acquire() and
smp_store_release() respectively.
smp_store_release() respectively. Therefore, if you find yourself only using
the Non-RMW operations of atomic_t, you do not in fact need atomic_t at all
and are doing it wrong.
The one detail to this is that atomic_set{}() should be observable to the RMW
A subtle detail of atomic_set{}() is that it should be observable to the RMW
ops. That is:
C atomic-set
@ -200,6 +202,9 @@ These helper barriers exist because architectures have varying implicit
ordering on their SMP atomic primitives. For example our TSO architectures
provide full ordered atomics and these barriers are no-ops.
NOTE: when the atomic RmW ops are fully ordered, they should also imply a
compiler barrier.
Thus:
atomic_fetch_add();

110
Documentation/locking/lockdep-design.txt
View File

@ -15,34 +15,48 @@ tens of thousands of) instantiations. For example a lock in the inode
struct is one class, while each inode has its own instantiation of that
lock class.
The validator tracks the 'state' of lock-classes, and it tracks
dependencies between different lock-classes. The validator maintains a
rolling proof that the state and the dependencies are correct.
The validator tracks the 'usage state' of lock-classes, and it tracks
the dependencies between different lock-classes. Lock usage indicates
how a lock is used with regard to its IRQ contexts, while lock
dependency can be understood as lock order, where L1 -> L2 suggests that
a task is attempting to acquire L2 while holding L1. From lockdep's
perspective, the two locks (L1 and L2) are not necessarily related; that
dependency just means the order ever happened. The validator maintains a
continuing effort to prove lock usages and dependencies are correct or
the validator will shoot a splat if incorrect.
Unlike an lock instantiation, the lock-class itself never goes away: when
a lock-class is used for the first time after bootup it gets registered,
and all subsequent uses of that lock-class will be attached to this
lock-class.
A lock-class's behavior is constructed by its instances collectively:
when the first instance of a lock-class is used after bootup the class
gets registered, then all (subsequent) instances will be mapped to the
class and hence their usages and dependecies will contribute to those of
the class. A lock-class does not go away when a lock instance does, but
it can be removed if the memory space of the lock class (static or
dynamic) is reclaimed, this happens for example when a module is
unloaded or a workqueue is destroyed.
State
-----
The validator tracks lock-class usage history into 4 * nSTATEs + 1 separate
state bits:
The validator tracks lock-class usage history and divides the usage into
(4 usages * n STATEs + 1) categories:
where the 4 usages can be:
- 'ever held in STATE context'
- 'ever held as readlock in STATE context'
- 'ever held with STATE enabled'
- 'ever held as readlock with STATE enabled'
Where STATE can be either one of (kernel/locking/lockdep_states.h)
- hardirq
- softirq
where the n STATEs are coded in kernel/locking/lockdep_states.h and as of
now they include:
- hardirq
- softirq
where the last 1 category is:
- 'ever used' [ == !unused ]
When locking rules are violated, these state bits are presented in the
locking error messages, inside curlies. A contrived example:
When locking rules are violated, these usage bits are presented in the
locking error messages, inside curlies, with a total of 2 * n STATEs bits.
A contrived example:
modprobe/2287 is trying to acquire lock:
(&sio_locks[i].lock){-.-.}, at: [<c02867fd>] mutex_lock+0x21/0x24
@ -51,28 +65,67 @@ locking error messages, inside curlies. A contrived example:
(&sio_locks[i].lock){-.-.}, at: [<c02867fd>] mutex_lock+0x21/0x24
The bit position indicates STATE, STATE-read, for each of the states listed
above, and the character displayed in each indicates:
For a given lock, the bit positions from left to right indicate the usage
of the lock and readlock (if exists), for each of the n STATEs listed
above respectively, and the character displayed at each bit position
indicates:
'.' acquired while irqs disabled and not in irq context
'-' acquired in irq context
'+' acquired with irqs enabled
'?' acquired in irq context with irqs enabled.
Unused mutexes cannot be part of the cause of an error.
The bits are illustrated with an example:
(&sio_locks[i].lock){-.-.}, at: [<c02867fd>] mutex_lock+0x21/0x24
||||
||| \-> softirq disabled and not in softirq context
|| \--> acquired in softirq context
| \---> hardirq disabled and not in hardirq context
\----> acquired in hardirq context
For a given STATE, whether the lock is ever acquired in that STATE
context and whether that STATE is enabled yields four possible cases as
shown in the table below. The bit character is able to indicate which
exact case is for the lock as of the reporting time.
-------------------------------------------
| | irq enabled | irq disabled |
|-------------------------------------------|
| ever in irq | ? | - |
|-------------------------------------------|
| never in irq | + | . |
-------------------------------------------
The character '-' suggests irq is disabled because if otherwise the
charactor '?' would have been shown instead. Similar deduction can be
applied for '+' too.
Unused locks (e.g., mutexes) cannot be part of the cause of an error.
Single-lock state rules:
------------------------
A lock is irq-safe means it was ever used in an irq context, while a lock
is irq-unsafe means it was ever acquired with irq enabled.
A softirq-unsafe lock-class is automatically hardirq-unsafe as well. The
following states are exclusive, and only one of them is allowed to be
set for any lock-class:
following states must be exclusive: only one of them is allowed to be set
for any lock-class based on its usage:
<hardirq-safe> and <hardirq-unsafe>
<softirq-safe> and <softirq-unsafe>
<hardirq-safe> or <hardirq-unsafe>
<softirq-safe> or <softirq-unsafe>
The validator detects and reports lock usage that violate these
This is because if a lock can be used in irq context (irq-safe) then it
cannot be ever acquired with irq enabled (irq-unsafe). Otherwise, a
deadlock may happen. For example, in the scenario that after this lock
was acquired but before released, if the context is interrupted this
lock will be attempted to acquire twice, which creates a deadlock,
referred to as lock recursion deadlock.
The validator detects and reports lock usage that violates these
single-lock state rules.
Multi-lock dependency rules:
@ -81,15 +134,18 @@ Multi-lock dependency rules:
The same lock-class must not be acquired twice, because this could lead
to lock recursion deadlocks.
Furthermore, two locks may not be taken in different order:
Furthermore, two locks can not be taken in inverse order:
<L1> -> <L2>
<L2> -> <L1>
because this could lead to lock inversion deadlocks. (The validator
finds such dependencies in arbitrary complexity, i.e. there can be any
other locking sequence between the acquire-lock operations, the
validator will still track all dependencies between locks.)
because this could lead to a deadlock - referred to as lock inversion
deadlock - as attempts to acquire the two locks form a circle which
could lead to the two contexts waiting for each other permanently. The
validator will find such dependency circle in arbitrary complexity,
i.e., there can be any other locking sequence between the acquire-lock
operations; the validator will still find whether these locks can be
acquired in a circular fashion.
Furthermore, the following usage based lock dependencies are not allowed
between any two lock-classes:

20
arch/alpha/include/asm/atomic.h
View File

@ -93,9 +93,9 @@ static inline int atomic_fetch_##op##_relaxed(int i, atomic_t *v) \
}
#define ATOMIC64_OP(op, asm_op) \
static __inline__ void atomic64_##op(long i, atomic64_t * v) \
static __inline__ void atomic64_##op(s64 i, atomic64_t * v) \
{ \
unsigned long temp; \
s64 temp; \
__asm__ __volatile__( \
"1: ldq_l %0,%1\n" \
" " #asm_op " %0,%2,%0\n" \
@ -109,9 +109,9 @@ static __inline__ void atomic64_##op(long i, atomic64_t * v) \
} \
#define ATOMIC64_OP_RETURN(op, asm_op) \
static __inline__ long atomic64_##op##_return_relaxed(long i, atomic64_t * v) \
static __inline__ s64 atomic64_##op##_return_relaxed(s64 i, atomic64_t * v) \
{ \
long temp, result; \
s64 temp, result; \
__asm__ __volatile__( \
"1: ldq_l %0,%1\n" \
" " #asm_op " %0,%3,%2\n" \
@ -128,9 +128,9 @@ static __inline__ long atomic64_##op##_return_relaxed(long i, atomic64_t * v) \
}
#define ATOMIC64_FETCH_OP(op, asm_op) \
static __inline__ long atomic64_fetch_##op##_relaxed(long i, atomic64_t * v) \
static __inline__ s64 atomic64_fetch_##op##_relaxed(s64 i, atomic64_t * v) \
{ \
long temp, result; \
s64 temp, result; \
__asm__ __volatile__( \
"1: ldq_l %2,%1\n" \
" " #asm_op " %2,%3,%0\n" \
@ -246,9 +246,9 @@ static __inline__ int atomic_fetch_add_unless(atomic_t *v, int a, int u)
* Atomically adds @a to @v, so long as it was not @u.
* Returns the old value of @v.
*/
static __inline__ long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
static __inline__ s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
long c, new, old;
s64 c, new, old;
smp_mb();
__asm__ __volatile__(
"1: ldq_l %[old],%[mem]\n"
@ -276,9 +276,9 @@ static __inline__ long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
* The function returns the old value of *v minus 1, even if
* the atomic variable, v, was not decremented.
*/
static inline long atomic64_dec_if_positive(atomic64_t *v)
static inline s64 atomic64_dec_if_positive(atomic64_t *v)
{
long old, tmp;
s64 old, tmp;
smp_mb();
__asm__ __volatile__(
"1: ldq_l %[old],%[mem]\n"

41
arch/arc/include/asm/atomic.h
View File

@ -321,14 +321,14 @@ ATOMIC_OPS(xor, ^=, CTOP_INST_AXOR_DI_R2_R2_R3)
*/
typedef struct {
aligned_u64 counter;
s64 __aligned(8) counter;
} atomic64_t;
#define ATOMIC64_INIT(a) { (a) }
static inline long long atomic64_read(const atomic64_t *v)
static inline s64 atomic64_read(const atomic64_t *v)
{
unsigned long long val;
s64 val;
__asm__ __volatile__(
" ldd %0, [%1] \n"
@ -338,7 +338,7 @@ static inline long long atomic64_read(const atomic64_t *v)
return val;
}
static inline void atomic64_set(atomic64_t *v, long long a)
static inline void atomic64_set(atomic64_t *v, s64 a)
{
/*
* This could have been a simple assignment in "C" but would need
@ -359,9 +359,9 @@ static inline void atomic64_set(atomic64_t *v, long long a)
}
#define ATOMIC64_OP(op, op1, op2) \
static inline void atomic64_##op(long long a, atomic64_t *v) \
static inline void atomic64_##op(s64 a, atomic64_t *v) \
{ \
unsigned long long val; \
s64 val; \
\
__asm__ __volatile__( \
"1: \n" \
@ -372,13 +372,13 @@ static inline void atomic64_##op(long long a, atomic64_t *v) \
" bnz 1b \n" \
: "=&r"(val) \
: "r"(&v->counter), "ir"(a) \
: "cc"); \
: "cc"); \
} \
#define ATOMIC64_OP_RETURN(op, op1, op2) \
static inline long long atomic64_##op##_return(long long a, atomic64_t *v) \
static inline s64 atomic64_##op##_return(s64 a, atomic64_t *v) \
{ \
unsigned long long val; \
s64 val; \
\
smp_mb(); \
\
@ -399,9 +399,9 @@ static inline long long atomic64_##op##_return(long long a, atomic64_t *v) \
}
#define ATOMIC64_FETCH_OP(op, op1, op2) \
static inline long long atomic64_fetch_##op(long long a, atomic64_t *v) \
static inline s64 atomic64_fetch_##op(s64 a, atomic64_t *v) \
{ \
unsigned long long val, orig; \
s64 val, orig; \
\
smp_mb(); \
\
@ -441,10 +441,10 @@ ATOMIC64_OPS(xor, xor, xor)
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
static inline long long
atomic64_cmpxchg(atomic64_t *ptr, long long expected, long long new)
static inline s64
atomic64_cmpxchg(atomic64_t *ptr, s64 expected, s64 new)
{
long long prev;
s64 prev;
smp_mb();
@ -464,9 +464,9 @@ atomic64_cmpxchg(atomic64_t *ptr, long long expected, long long new)
return prev;
}
static inline long long atomic64_xchg(atomic64_t *ptr, long long new)
static inline s64 atomic64_xchg(atomic64_t *ptr, s64 new)
{
long long prev;
s64 prev;
smp_mb();
@ -492,9 +492,9 @@ static inline long long atomic64_xchg(atomic64_t *ptr, long long new)
* the atomic variable, v, was not decremented.
*/
static inline long long atomic64_dec_if_positive(atomic64_t *v)
static inline s64 atomic64_dec_if_positive(atomic64_t *v)
{
long long val;
s64 val;
smp_mb();
@ -525,10 +525,9 @@ static inline long long atomic64_dec_if_positive(atomic64_t *v)
* Atomically adds @a to @v, if it was not @u.
* Returns the old value of @v
*/
static inline long long atomic64_fetch_add_unless(atomic64_t *v, long long a,
long long u)
static inline s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
long long old, temp;
s64 old, temp;
smp_mb();

50
arch/arm/include/asm/atomic.h
View File

@ -246,15 +246,15 @@ ATOMIC_OPS(xor, ^=, eor)
#ifndef CONFIG_GENERIC_ATOMIC64
typedef struct {
long long counter;
s64 counter;
} atomic64_t;
#define ATOMIC64_INIT(i) { (i) }
#ifdef CONFIG_ARM_LPAE
static inline long long atomic64_read(const atomic64_t *v)
static inline s64 atomic64_read(const atomic64_t *v)
{
long long result;
s64 result;
__asm__ __volatile__("@ atomic64_read\n"
" ldrd %0, %H0, [%1]"
@ -265,7 +265,7 @@ static inline long long atomic64_read(const atomic64_t *v)
return result;
}
static inline void atomic64_set(atomic64_t *v, long long i)
static inline void atomic64_set(atomic64_t *v, s64 i)
{
__asm__ __volatile__("@ atomic64_set\n"
" strd %2, %H2, [%1]"
@ -274,9 +274,9 @@ static inline void atomic64_set(atomic64_t *v, long long i)
);
}
#else
static inline long long atomic64_read(const atomic64_t *v)
static inline s64 atomic64_read(const atomic64_t *v)
{
long long result;
s64 result;
__asm__ __volatile__("@ atomic64_read\n"
" ldrexd %0, %H0, [%1]"
@ -287,9 +287,9 @@ static inline long long atomic64_read(const atomic64_t *v)
return result;
}
static inline void atomic64_set(atomic64_t *v, long long i)
static inline void atomic64_set(atomic64_t *v, s64 i)
{
long long tmp;
s64 tmp;
prefetchw(&v->counter);
__asm__ __volatile__("@ atomic64_set\n"
@ -304,9 +304,9 @@ static inline void atomic64_set(atomic64_t *v, long long i)
#endif
#define ATOMIC64_OP(op, op1, op2) \
static inline void atomic64_##op(long long i, atomic64_t *v) \
static inline void atomic64_##op(s64 i, atomic64_t *v) \
{ \
long long result; \
s64 result; \
unsigned long tmp; \
\
prefetchw(&v->counter); \
@ -323,10 +323,10 @@ static inline void atomic64_##op(long long i, atomic64_t *v) \
} \
#define ATOMIC64_OP_RETURN(op, op1, op2) \
static inline long long \
atomic64_##op##_return_relaxed(long long i, atomic64_t *v) \
static inline s64 \
atomic64_##op##_return_relaxed(s64 i, atomic64_t *v) \
{ \
long long result; \
s64 result; \
unsigned long tmp; \
\
prefetchw(&v->counter); \
@ -346,10 +346,10 @@ atomic64_##op##_return_relaxed(long long i, atomic64_t *v) \
}
#define ATOMIC64_FETCH_OP(op, op1, op2) \
static inline long long \
atomic64_fetch_##op##_relaxed(long long i, atomic64_t *v) \
static inline s64 \
atomic64_fetch_##op##_relaxed(s64 i, atomic64_t *v) \
{ \
long long result, val; \
s64 result, val; \
unsigned long tmp; \
\
prefetchw(&v->counter); \
@ -403,10 +403,9 @@ ATOMIC64_OPS(xor, eor, eor)
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
static inline long long
atomic64_cmpxchg_relaxed(atomic64_t *ptr, long long old, long long new)
static inline s64 atomic64_cmpxchg_relaxed(atomic64_t *ptr, s64 old, s64 new)
{
long long oldval;
s64 oldval;
unsigned long res;
prefetchw(&ptr->counter);
@ -427,9 +426,9 @@ atomic64_cmpxchg_relaxed(atomic64_t *ptr, long long old, long long new)
}
#define atomic64_cmpxchg_relaxed atomic64_cmpxchg_relaxed
static inline long long atomic64_xchg_relaxed(atomic64_t *ptr, long long new)
static inline s64 atomic64_xchg_relaxed(atomic64_t *ptr, s64 new)
{
long long result;
s64 result;
unsigned long tmp;
prefetchw(&ptr->counter);
@ -447,9 +446,9 @@ static inline long long atomic64_xchg_relaxed(atomic64_t *ptr, long long new)
}
#define atomic64_xchg_relaxed atomic64_xchg_relaxed
static inline long long atomic64_dec_if_positive(atomic64_t *v)
static inline s64 atomic64_dec_if_positive(atomic64_t *v)
{
long long result;
s64 result;
unsigned long tmp;
smp_mb();
@ -475,10 +474,9 @@ static inline long long atomic64_dec_if_positive(atomic64_t *v)
}
#define atomic64_dec_if_positive atomic64_dec_if_positive
static inline long long atomic64_fetch_add_unless(atomic64_t *v, long long a,
long long u)
static inline s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
long long oldval, newval;
s64 oldval, newval;
unsigned long tmp;
smp_mb();

20
arch/arm64/include/asm/atomic_ll_sc.h
View File

@ -122,9 +122,9 @@ ATOMIC_OPS(xor, eor)
#define ATOMIC64_OP(op, asm_op) \
__LL_SC_INLINE void \
__LL_SC_PREFIX(arch_atomic64_##op(long i, atomic64_t *v)) \
__LL_SC_PREFIX(arch_atomic64_##op(s64 i, atomic64_t *v)) \
{ \
long result; \
s64 result; \
unsigned long tmp; \
\
asm volatile("// atomic64_" #op "\n" \
@ -139,10 +139,10 @@ __LL_SC_PREFIX(arch_atomic64_##op(long i, atomic64_t *v)) \
__LL_SC_EXPORT(arch_atomic64_##op);
#define ATOMIC64_OP_RETURN(name, mb, acq, rel, cl, op, asm_op) \
__LL_SC_INLINE long \
__LL_SC_PREFIX(arch_atomic64_##op##_return##name(long i, atomic64_t *v))\
__LL_SC_INLINE s64 \
__LL_SC_PREFIX(arch_atomic64_##op##_return##name(s64 i, atomic64_t *v))\
{ \
long result; \
s64 result; \
unsigned long tmp; \
\
asm volatile("// atomic64_" #op "_return" #name "\n" \
@ -161,10 +161,10 @@ __LL_SC_PREFIX(arch_atomic64_##op##_return##name(long i, atomic64_t *v))\
__LL_SC_EXPORT(arch_atomic64_##op##_return##name);
#define ATOMIC64_FETCH_OP(name, mb, acq, rel, cl, op, asm_op) \
__LL_SC_INLINE long \
__LL_SC_PREFIX(arch_atomic64_fetch_##op##name(long i, atomic64_t *v)) \
__LL_SC_INLINE s64 \
__LL_SC_PREFIX(arch_atomic64_fetch_##op##name(s64 i, atomic64_t *v)) \
{ \
long result, val; \
s64 result, val; \
unsigned long tmp; \
\
asm volatile("// atomic64_fetch_" #op #name "\n" \
@ -214,10 +214,10 @@ ATOMIC64_OPS(xor, eor)
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
__LL_SC_INLINE long
__LL_SC_INLINE s64
__LL_SC_PREFIX(arch_atomic64_dec_if_positive(atomic64_t *v))
{
long result;
s64 result;
unsigned long tmp;
asm volatile("// atomic64_dec_if_positive\n"

34
arch/arm64/include/asm/atomic_lse.h
View File

@ -213,9 +213,9 @@ ATOMIC_FETCH_OP_SUB( , al, "memory")
#define __LL_SC_ATOMIC64(op) __LL_SC_CALL(arch_atomic64_##op)
#define ATOMIC64_OP(op, asm_op) \
static inline void arch_atomic64_##op(long i, atomic64_t *v) \
static inline void arch_atomic64_##op(s64 i, atomic64_t *v) \
{ \
register long x0 asm ("x0") = i; \
register s64 x0 asm ("x0") = i; \
register atomic64_t *x1 asm ("x1") = v; \
\
asm volatile(ARM64_LSE_ATOMIC_INSN(__LL_SC_ATOMIC64(op), \
@ -233,9 +233,9 @@ ATOMIC64_OP(add, stadd)
#undef ATOMIC64_OP
#define ATOMIC64_FETCH_OP(name, mb, op, asm_op, cl...) \
static inline long arch_atomic64_fetch_##op##name(long i, atomic64_t *v)\
static inline s64 arch_atomic64_fetch_##op##name(s64 i, atomic64_t *v) \
{ \
register long x0 asm ("x0") = i; \
register s64 x0 asm ("x0") = i; \
register atomic64_t *x1 asm ("x1") = v; \
\
asm volatile(ARM64_LSE_ATOMIC_INSN( \
@ -265,9 +265,9 @@ ATOMIC64_FETCH_OPS(add, ldadd)
#undef ATOMIC64_FETCH_OPS
#define ATOMIC64_OP_ADD_RETURN(name, mb, cl...) \
static inline long arch_atomic64_add_return##name(long i, atomic64_t *v)\
static inline s64 arch_atomic64_add_return##name(s64 i, atomic64_t *v) \
{ \
register long x0 asm ("x0") = i; \
register s64 x0 asm ("x0") = i; \
register atomic64_t *x1 asm ("x1") = v; \
\
asm volatile(ARM64_LSE_ATOMIC_INSN( \
@ -291,9 +291,9 @@ ATOMIC64_OP_ADD_RETURN( , al, "memory")
#undef ATOMIC64_OP_ADD_RETURN
static inline void arch_atomic64_and(long i, atomic64_t *v)
static inline void arch_atomic64_and(s64 i, atomic64_t *v)
{
register long x0 asm ("x0") = i;
register s64 x0 asm ("x0") = i;
register atomic64_t *x1 asm ("x1") = v;
asm volatile(ARM64_LSE_ATOMIC_INSN(
@ -309,9 +309,9 @@ static inline void arch_atomic64_and(long i, atomic64_t *v)
}
#define ATOMIC64_FETCH_OP_AND(name, mb, cl...) \
static inline long arch_atomic64_fetch_and##name(long i, atomic64_t *v) \
static inline s64 arch_atomic64_fetch_and##name(s64 i, atomic64_t *v) \
{ \
register long x0 asm ("x0") = i; \
register s64 x0 asm ("x0") = i; \
register atomic64_t *x1 asm ("x1") = v; \
\
asm volatile(ARM64_LSE_ATOMIC_INSN( \
@ -335,9 +335,9 @@ ATOMIC64_FETCH_OP_AND( , al, "memory")
#undef ATOMIC64_FETCH_OP_AND
static inline void arch_atomic64_sub(long i, atomic64_t *v)
static inline void arch_atomic64_sub(s64 i, atomic64_t *v)
{
register long x0 asm ("x0") = i;
register s64 x0 asm ("x0") = i;
register atomic64_t *x1 asm ("x1") = v;
asm volatile(ARM64_LSE_ATOMIC_INSN(
@ -353,9 +353,9 @@ static inline void arch_atomic64_sub(long i, atomic64_t *v)
}
#define ATOMIC64_OP_SUB_RETURN(name, mb, cl...) \
static inline long arch_atomic64_sub_return##name(long i, atomic64_t *v)\
static inline s64 arch_atomic64_sub_return##name(s64 i, atomic64_t *v) \
{ \
register long x0 asm ("x0") = i; \
register s64 x0 asm ("x0") = i; \
register atomic64_t *x1 asm ("x1") = v; \
\
asm volatile(ARM64_LSE_ATOMIC_INSN( \
@ -381,9 +381,9 @@ ATOMIC64_OP_SUB_RETURN( , al, "memory")
#undef ATOMIC64_OP_SUB_RETURN
#define ATOMIC64_FETCH_OP_SUB(name, mb, cl...) \
static inline long arch_atomic64_fetch_sub##name(long i, atomic64_t *v) \
static inline s64 arch_atomic64_fetch_sub##name(s64 i, atomic64_t *v) \
{ \
register long x0 asm ("x0") = i; \
register s64 x0 asm ("x0") = i; \
register atomic64_t *x1 asm ("x1") = v; \
\
asm volatile(ARM64_LSE_ATOMIC_INSN( \
@ -407,7 +407,7 @@ ATOMIC64_FETCH_OP_SUB( , al, "memory")
#undef ATOMIC64_FETCH_OP_SUB
static inline long arch_atomic64_dec_if_positive(atomic64_t *v)
static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
{
register long x0 asm ("x0") = (long)v;

20
arch/ia64/include/asm/atomic.h
View File

@ -124,10 +124,10 @@ ATOMIC_FETCH_OP(xor, ^)
#undef ATOMIC_OP
#define ATOMIC64_OP(op, c_op) \
static __inline__ long \
ia64_atomic64_##op (__s64 i, atomic64_t *v) \
static __inline__ s64 \
ia64_atomic64_##op (s64 i, atomic64_t *v) \
{ \
__s64 old, new; \
s64 old, new; \
CMPXCHG_BUGCHECK_DECL \
\
do { \
@ -139,10 +139,10 @@ ia64_atomic64_##op (__s64 i, atomic64_t *v) \
}
#define ATOMIC64_FETCH_OP(op, c_op) \
static __inline__ long \
ia64_atomic64_fetch_##op (__s64 i, atomic64_t *v) \
static __inline__ s64 \
ia64_atomic64_fetch_##op (s64 i, atomic64_t *v) \
{ \
__s64 old, new; \
s64 old, new; \
CMPXCHG_BUGCHECK_DECL \
\
do { \
@ -162,7 +162,7 @@ ATOMIC64_OPS(sub, -)
#define atomic64_add_return(i,v) \
({ \
long __ia64_aar_i = (i); \
s64 __ia64_aar_i = (i); \
__ia64_atomic_const(i) \
? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
: ia64_atomic64_add(__ia64_aar_i, v); \
@ -170,7 +170,7 @@ ATOMIC64_OPS(sub, -)
#define atomic64_sub_return(i,v) \
({ \
long __ia64_asr_i = (i); \
s64 __ia64_asr_i = (i); \
__ia64_atomic_const(i) \
? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
: ia64_atomic64_sub(__ia64_asr_i, v); \
@ -178,7 +178,7 @@ ATOMIC64_OPS(sub, -)
#define atomic64_fetch_add(i,v) \
({ \
long __ia64_aar_i = (i); \
s64 __ia64_aar_i = (i); \
__ia64_atomic_const(i) \
? ia64_fetchadd(__ia64_aar_i, &(v)->counter, acq) \
: ia64_atomic64_fetch_add(__ia64_aar_i, v); \
@ -186,7 +186,7 @@ ATOMIC64_OPS(sub, -)
#define atomic64_fetch_sub(i,v) \
({ \
long __ia64_asr_i = (i); \
s64 __ia64_asr_i = (i); \
__ia64_atomic_const(i) \
? ia64_fetchadd(-__ia64_asr_i, &(v)->counter, acq) \
: ia64_atomic64_fetch_sub(__ia64_asr_i, v); \

22
arch/mips/include/asm/atomic.h
View File

@ -254,10 +254,10 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
#define atomic64_set(v, i) WRITE_ONCE((v)->counter, (i))
#define ATOMIC64_OP(op, c_op, asm_op) \
static __inline__ void atomic64_##op(long i, atomic64_t * v) \
static __inline__ void atomic64_##op(s64 i, atomic64_t * v) \
{ \
if (kernel_uses_llsc) { \
long temp; \
s64 temp; \
\
loongson_llsc_mb(); \
__asm__ __volatile__( \
@ -280,12 +280,12 @@ static __inline__ void atomic64_##op(long i, atomic64_t * v) \
}
#define ATOMIC64_OP_RETURN(op, c_op, asm_op) \
static __inline__ long atomic64_##op##_return_relaxed(long i, atomic64_t * v) \
static __inline__ s64 atomic64_##op##_return_relaxed(s64 i, atomic64_t * v) \
{ \
long result; \
s64 result; \
\
if (kernel_uses_llsc) { \
long temp; \
s64 temp; \
\
loongson_llsc_mb(); \
__asm__ __volatile__( \
@ -314,12 +314,12 @@ static __inline__ long atomic64_##op##_return_relaxed(long i, atomic64_t * v) \
}
#define ATOMIC64_FETCH_OP(op, c_op, asm_op) \
static __inline__ long atomic64_fetch_##op##_relaxed(long i, atomic64_t * v) \
static __inline__ s64 atomic64_fetch_##op##_relaxed(s64 i, atomic64_t * v) \
{ \
long result; \
s64 result; \
\
if (kernel_uses_llsc) { \
long temp; \
s64 temp; \
\
loongson_llsc_mb(); \
__asm__ __volatile__( \
@ -386,14 +386,14 @@ ATOMIC64_OPS(xor, ^=, xor)
* Atomically test @v and subtract @i if @v is greater or equal than @i.
* The function returns the old value of @v minus @i.
*/
static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
static __inline__ s64 atomic64_sub_if_positive(s64 i, atomic64_t * v)
{
long result;
s64 result;
smp_mb__before_llsc();
if (kernel_uses_llsc) {
long temp;
s64 temp;
__asm__ __volatile__(
" .set push \n"

44
arch/powerpc/include/asm/atomic.h
View File

@ -297,24 +297,24 @@ static __inline__ int atomic_dec_if_positive(atomic_t *v)
#define ATOMIC64_INIT(i) { (i) }
static __inline__ long atomic64_read(const atomic64_t *v)
static __inline__ s64 atomic64_read(const atomic64_t *v)
{
long t;
s64 t;
__asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));
return t;
}
static __inline__ void atomic64_set(atomic64_t *v, long i)
static __inline__ void atomic64_set(atomic64_t *v, s64 i)
{
__asm__ __volatile__("std%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i));
}
#define ATOMIC64_OP(op, asm_op) \
static __inline__ void atomic64_##op(long a, atomic64_t *v) \
static __inline__ void atomic64_##op(s64 a, atomic64_t *v) \
{ \
long t; \
s64 t; \
\
__asm__ __volatile__( \
"1: ldarx %0,0,%3 # atomic64_" #op "\n" \
@ -327,10 +327,10 @@ static __inline__ void atomic64_##op(long a, atomic64_t *v) \
}
#define ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \
static inline long \
atomic64_##op##_return_relaxed(long a, atomic64_t *v) \
static inline s64 \
atomic64_##op##_return_relaxed(s64 a, atomic64_t *v) \
{ \
long t; \
s64 t; \
\
__asm__ __volatile__( \
"1: ldarx %0,0,%3 # atomic64_" #op "_return_relaxed\n" \
@ -345,10 +345,10 @@ atomic64_##op##_return_relaxed(long a, atomic64_t *v) \
}
#define ATOMIC64_FETCH_OP_RELAXED(op, asm_op) \
static inline long \
atomic64_fetch_##op##_relaxed(long a, atomic64_t *v) \
static inline s64 \
atomic64_fetch_##op##_relaxed(s64 a, atomic64_t *v) \
{ \
long res, t; \
s64 res, t; \
\
__asm__ __volatile__( \
"1: ldarx %0,0,%4 # atomic64_fetch_" #op "_relaxed\n" \
@ -396,7 +396,7 @@ ATOMIC64_OPS(xor, xor)
static __inline__ void atomic64_inc(atomic64_t *v)
{
long t;
s64 t;
__asm__ __volatile__(
"1: ldarx %0,0,%2 # atomic64_inc\n\
@ -409,9 +409,9 @@ static __inline__ void atomic64_inc(atomic64_t *v)
}
#define atomic64_inc atomic64_inc
static __inline__ long atomic64_inc_return_relaxed(atomic64_t *v)
static __inline__ s64 atomic64_inc_return_relaxed(atomic64_t *v)
{
long t;
s64 t;
__asm__ __volatile__(
"1: ldarx %0,0,%2 # atomic64_inc_return_relaxed\n"
@ -427,7 +427,7 @@ static __inline__ long atomic64_inc_return_relaxed(atomic64_t *v)
static __inline__ void atomic64_dec(atomic64_t *v)
{
long t;
s64 t;
__asm__ __volatile__(
"1: ldarx %0,0,%2 # atomic64_dec\n\
@ -440,9 +440,9 @@ static __inline__ void atomic64_dec(atomic64_t *v)
}
#define atomic64_dec atomic64_dec
static __inline__ long atomic64_dec_return_relaxed(atomic64_t *v)
static __inline__ s64 atomic64_dec_return_relaxed(atomic64_t *v)
{
long t;
s64 t;
__asm__ __volatile__(
"1: ldarx %0,0,%2 # atomic64_dec_return_relaxed\n"
@ -463,9 +463,9 @@ static __inline__ long atomic64_dec_return_relaxed(atomic64_t *v)
* Atomically test *v and decrement if it is greater than 0.
* The function returns the old value of *v minus 1.
*/
static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
static __inline__ s64 atomic64_dec_if_positive(atomic64_t *v)
{
long t;
s64 t;
__asm__ __volatile__(
PPC_ATOMIC_ENTRY_BARRIER
@ -502,9 +502,9 @@ static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
* Atomically adds @a to @v, so long as it was not @u.
* Returns the old value of @v.
*/
static __inline__ long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
static __inline__ s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
long t;
s64 t;
__asm__ __volatile__ (
PPC_ATOMIC_ENTRY_BARRIER
@ -534,7 +534,7 @@ static __inline__ long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
*/
static __inline__ int atomic64_inc_not_zero(atomic64_t *v)
{
long t1, t2;
s64 t1, t2;
__asm__ __volatile__ (
PPC_ATOMIC_ENTRY_BARRIER

44
arch/riscv/include/asm/atomic.h
View File

@ -38,11 +38,11 @@ static __always_inline void atomic_set(atomic_t *v, int i)
#ifndef CONFIG_GENERIC_ATOMIC64
#define ATOMIC64_INIT(i) { (i) }
static __always_inline long atomic64_read(const atomic64_t *v)
static __always_inline s64 atomic64_read(const atomic64_t *v)
{
return READ_ONCE(v->counter);
}
static __always_inline void atomic64_set(atomic64_t *v, long i)
static __always_inline void atomic64_set(atomic64_t *v, s64 i)
{
WRITE_ONCE(v->counter, i);
}
@ -66,11 +66,11 @@ void atomic##prefix##_##op(c_type i, atomic##prefix##_t *v) \
#ifdef CONFIG_GENERIC_ATOMIC64
#define ATOMIC_OPS(op, asm_op, I) \
ATOMIC_OP (op, asm_op, I, w, int, )
ATOMIC_OP (op, asm_op, I, w, int, )
#else
#define ATOMIC_OPS(op, asm_op, I) \
ATOMIC_OP (op, asm_op, I, w, int, ) \
ATOMIC_OP (op, asm_op, I, d, long, 64)
ATOMIC_OP (op, asm_op, I, w, int, ) \
ATOMIC_OP (op, asm_op, I, d, s64, 64)
#endif
ATOMIC_OPS(add, add, i)
@ -127,14 +127,14 @@ c_type atomic##prefix##_##op##_return(c_type i, atomic##prefix##_t *v) \
#ifdef CONFIG_GENERIC_ATOMIC64
#define ATOMIC_OPS(op, asm_op, c_op, I) \
ATOMIC_FETCH_OP( op, asm_op, I, w, int, ) \
ATOMIC_OP_RETURN(op, asm_op, c_op, I, w, int, )
ATOMIC_FETCH_OP( op, asm_op, I, w, int, ) \
ATOMIC_OP_RETURN(op, asm_op, c_op, I, w, int, )
#else
#define ATOMIC_OPS(op, asm_op, c_op, I) \
ATOMIC_FETCH_OP( op, asm_op, I, w, int, ) \
ATOMIC_OP_RETURN(op, asm_op, c_op, I, w, int, ) \
ATOMIC_FETCH_OP( op, asm_op, I, d, long, 64) \
ATOMIC_OP_RETURN(op, asm_op, c_op, I, d, long, 64)
ATOMIC_FETCH_OP( op, asm_op, I, w, int, ) \
ATOMIC_OP_RETURN(op, asm_op, c_op, I, w, int, ) \
ATOMIC_FETCH_OP( op, asm_op, I, d, s64, 64) \
ATOMIC_OP_RETURN(op, asm_op, c_op, I, d, s64, 64)
#endif
ATOMIC_OPS(add, add, +, i)
@ -166,11 +166,11 @@ ATOMIC_OPS(sub, add, +, -i)
#ifdef CONFIG_GENERIC_ATOMIC64
#define ATOMIC_OPS(op, asm_op, I) \
ATOMIC_FETCH_OP(op, asm_op, I, w, int, )
ATOMIC_FETCH_OP(op, asm_op, I, w, int, )
#else
#define ATOMIC_OPS(op, asm_op, I) \
ATOMIC_FETCH_OP(op, asm_op, I, w, int, ) \
ATOMIC_FETCH_OP(op, asm_op, I, d, long, 64)
ATOMIC_FETCH_OP(op, asm_op, I, w, int, ) \
ATOMIC_FETCH_OP(op, asm_op, I, d, s64, 64)
#endif
ATOMIC_OPS(and, and, i)
@ -219,9 +219,10 @@ static __always_inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
#define atomic_fetch_add_unless atomic_fetch_add_unless
#ifndef CONFIG_GENERIC_ATOMIC64
static __always_inline long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
static __always_inline s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
long prev, rc;
s64 prev;
long rc;
__asm__ __volatile__ (
"0: lr.d %[p], %[c]\n"
@ -290,11 +291,11 @@ c_t atomic##prefix##_cmpxchg(atomic##prefix##_t *v, c_t o, c_t n) \
#ifdef CONFIG_GENERIC_ATOMIC64
#define ATOMIC_OPS() \
ATOMIC_OP( int, , 4)
ATOMIC_OP(int, , 4)
#else
#define ATOMIC_OPS() \
ATOMIC_OP( int, , 4) \
ATOMIC_OP(long, 64, 8)
ATOMIC_OP(int, , 4) \
ATOMIC_OP(s64, 64, 8)
#endif
ATOMIC_OPS()
@ -332,9 +333,10 @@ static __always_inline int atomic_sub_if_positive(atomic_t *v, int offset)
#define atomic_dec_if_positive(v) atomic_sub_if_positive(v, 1)
#ifndef CONFIG_GENERIC_ATOMIC64
static __always_inline long atomic64_sub_if_positive(atomic64_t *v, int offset)
static __always_inline s64 atomic64_sub_if_positive(atomic64_t *v, s64 offset)
{
long prev, rc;
s64 prev;
long rc;
__asm__ __volatile__ (
"0: lr.d %[p], %[c]\n"

38
arch/s390/include/asm/atomic.h
View File

@ -84,9 +84,9 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
#define ATOMIC64_INIT(i) { (i) }
static inline long atomic64_read(const atomic64_t *v)
static inline s64 atomic64_read(const atomic64_t *v)
{
long c;
s64 c;
asm volatile(
" lg %0,%1\n"
@ -94,49 +94,49 @@ static inline long atomic64_read(const atomic64_t *v)
return c;
}
static inline void atomic64_set(atomic64_t *v, long i)
static inline void atomic64_set(atomic64_t *v, s64 i)
{
asm volatile(
" stg %1,%0\n"
: "=Q" (v->counter) : "d" (i));
}
static inline long atomic64_add_return(long i, atomic64_t *v)
static inline s64 atomic64_add_return(s64 i, atomic64_t *v)
{
return __atomic64_add_barrier(i, &v->counter) + i;
return __atomic64_add_barrier(i, (long *)&v->counter) + i;
}
static inline long atomic64_fetch_add(long i, atomic64_t *v)
static inline s64 atomic64_fetch_add(s64 i, atomic64_t *v)
{
return __atomic64_add_barrier(i, &v->counter);
return __atomic64_add_barrier(i, (long *)&v->counter);
}
static inline void atomic64_add(long i, atomic64_t *v)
static inline void atomic64_add(s64 i, atomic64_t *v)
{
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
if (__builtin_constant_p(i) && (i > -129) && (i < 128)) {
__atomic64_add_const(i, &v->counter);
__atomic64_add_const(i, (long *)&v->counter);
return;
}
#endif
__atomic64_add(i, &v->counter);
__atomic64_add(i, (long *)&v->counter);
}
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
static inline long atomic64_cmpxchg(atomic64_t *v, long old, long new)
static inline s64 atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new)
{
return __atomic64_cmpxchg(&v->counter, old, new);
return __atomic64_cmpxchg((long *)&v->counter, old, new);
}
#define ATOMIC64_OPS(op) \
static inline void atomic64_##op(long i, atomic64_t *v) \
static inline void atomic64_##op(s64 i, atomic64_t *v) \
{ \
__atomic64_##op(i, &v->counter); \
__atomic64_##op(i, (long *)&v->counter); \
} \
static inline long atomic64_fetch_##op(long i, atomic64_t *v) \
static inline long atomic64_fetch_##op(s64 i, atomic64_t *v) \
{ \
return __atomic64_##op##_barrier(i, &v->counter); \
return __atomic64_##op##_barrier(i, (long *)&v->counter); \
}
ATOMIC64_OPS(and)
@ -145,8 +145,8 @@ ATOMIC64_OPS(xor)
#undef ATOMIC64_OPS
#define atomic64_sub_return(_i, _v) atomic64_add_return(-(long)(_i), _v)
#define atomic64_fetch_sub(_i, _v) atomic64_fetch_add(-(long)(_i), _v)
#define atomic64_sub(_i, _v) atomic64_add(-(long)(_i), _v)
#define atomic64_sub_return(_i, _v) atomic64_add_return(-(s64)(_i), _v)
#define atomic64_fetch_sub(_i, _v) atomic64_fetch_add(-(s64)(_i), _v)
#define atomic64_sub(_i, _v) atomic64_add(-(s64)(_i), _v)
#endif /* __ARCH_S390_ATOMIC__ */

2
arch/s390/pci/pci_debug.c
View File

@ -74,7 +74,7 @@ static void pci_sw_counter_show(struct seq_file *m)
int i;
for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
seq_printf(m, "%26s:\t%lu\n", pci_sw_names[i],
seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
atomic64_read(counter));
}

8
arch/sparc/include/asm/atomic_64.h
View File

@ -23,15 +23,15 @@
#define ATOMIC_OP(op) \
void atomic_##op(int, atomic_t *); \
void atomic64_##op(long, atomic64_t *);
void atomic64_##op(s64, atomic64_t *);
#define ATOMIC_OP_RETURN(op) \
int atomic_##op##_return(int, atomic_t *); \
long atomic64_##op##_return(long, atomic64_t *);
s64 atomic64_##op##_return(s64, atomic64_t *);
#define ATOMIC_FETCH_OP(op) \
int atomic_fetch_##op(int, atomic_t *); \
long atomic64_fetch_##op(long, atomic64_t *);
s64 atomic64_fetch_##op(s64, atomic64_t *);
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
@ -61,7 +61,7 @@ static inline int atomic_xchg(atomic_t *v, int new)
((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
long atomic64_dec_if_positive(atomic64_t *v);
s64 atomic64_dec_if_positive(atomic64_t *v);
#define atomic64_dec_if_positive atomic64_dec_if_positive
#endif /* !(__ARCH_SPARC64_ATOMIC__) */

2
arch/x86/events/core.c
View File

@ -2179,7 +2179,7 @@ static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm)
* For now, this can't happen because all callers hold mmap_sem
* for write. If this changes, we'll need a different solution.
*/
lockdep_assert_held_exclusive(&mm->mmap_sem);
lockdep_assert_held_write(&mm->mmap_sem);
if (atomic_inc_return(&mm->context.perf_rdpmc_allowed) == 1)
on_each_cpu_mask(mm_cpumask(mm), refresh_pce, NULL, 1);

8
arch/x86/include/asm/atomic.h
View File

@ -54,7 +54,7 @@ static __always_inline void arch_atomic_add(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "addl %1,%0"
: "+m" (v->counter)
: "ir" (i));
: "ir" (i) : "memory");
}
/**
@ -68,7 +68,7 @@ static __always_inline void arch_atomic_sub(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "subl %1,%0"
: "+m" (v->counter)
: "ir" (i));
: "ir" (i) : "memory");
}
/**
@ -95,7 +95,7 @@ static __always_inline bool arch_atomic_sub_and_test(int i, atomic_t *v)
static __always_inline void arch_atomic_inc(atomic_t *v)
{
asm volatile(LOCK_PREFIX "incl %0"
: "+m" (v->counter));
: "+m" (v->counter) :: "memory");
}
#define arch_atomic_inc arch_atomic_inc
@ -108,7 +108,7 @@ static __always_inline void arch_atomic_inc(atomic_t *v)
static __always_inline void arch_atomic_dec(atomic_t *v)
{
asm volatile(LOCK_PREFIX "decl %0"
: "+m" (v->counter));
: "+m" (v->counter) :: "memory");
}
#define arch_atomic_dec arch_atomic_dec

66
arch/x86/include/asm/atomic64_32.h
View File

@ -9,7 +9,7 @@
/* An 64bit atomic type */
typedef struct {
u64 __aligned(8) counter;
s64 __aligned(8) counter;
} atomic64_t;
#define ATOMIC64_INIT(val) { (val) }
@ -71,8 +71,7 @@ ATOMIC64_DECL(add_unless);
* the old value.
*/
static inline long long arch_atomic64_cmpxchg(atomic64_t *v, long long o,
long long n)
static inline s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
{
return arch_cmpxchg64(&v->counter, o, n);
}
@ -85,9 +84,9 @@ static inline long long arch_atomic64_cmpxchg(atomic64_t *v, long long o,
* Atomically xchgs the value of @v to @n and returns
* the old value.
*/
static inline long long arch_atomic64_xchg(atomic64_t *v, long long n)
static inline s64 arch_atomic64_xchg(atomic64_t *v, s64 n)
{
long long o;
s64 o;
unsigned high = (unsigned)(n >> 32);
unsigned low = (unsigned)n;
alternative_atomic64(xchg, "=&A" (o),
@ -103,7 +102,7 @@ static inline long long arch_atomic64_xchg(atomic64_t *v, long long n)
*
* Atomically sets the value of @v to @n.
*/
static inline void arch_atomic64_set(atomic64_t *v, long long i)
static inline void arch_atomic64_set(atomic64_t *v, s64 i)
{
unsigned high = (unsigned)(i >> 32);
unsigned low = (unsigned)i;
@ -118,9 +117,9 @@ static inline void arch_atomic64_set(atomic64_t *v, long long i)
*
* Atomically reads the value of @v and returns it.
*/
static inline long long arch_atomic64_read(const atomic64_t *v)
static inline s64 arch_atomic64_read(const atomic64_t *v)
{
long long r;
s64 r;
alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
return r;
}
@ -132,7 +131,7 @@ static inline long long arch_atomic64_read(const atomic64_t *v)
*
* Atomically adds @i to @v and returns @i + *@v
*/
static inline long long arch_atomic64_add_return(long long i, atomic64_t *v)
static inline s64 arch_atomic64_add_return(s64 i, atomic64_t *v)
{
alternative_atomic64(add_return,
ASM_OUTPUT2("+A" (i), "+c" (v)),
@ -143,7 +142,7 @@ static inline long long arch_atomic64_add_return(long long i, atomic64_t *v)
/*
* Other variants with different arithmetic operators:
*/
static inline long long arch_atomic64_sub_return(long long i, atomic64_t *v)
static inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v)
{
alternative_atomic64(sub_return,
ASM_OUTPUT2("+A" (i), "+c" (v)),
@ -151,18 +150,18 @@ static inline long long arch_atomic64_sub_return(long long i, atomic64_t *v)
return i;
}
static inline long long arch_atomic64_inc_return(atomic64_t *v)
static inline s64 arch_atomic64_inc_return(atomic64_t *v)
{
long long a;
s64 a;
alternative_atomic64(inc_return, "=&A" (a),
"S" (v) : "memory", "ecx");
return a;
}
#define arch_atomic64_inc_return arch_atomic64_inc_return
static inline long long arch_atomic64_dec_return(atomic64_t *v)
static inline s64 arch_atomic64_dec_return(atomic64_t *v)
{
long long a;
s64 a;
alternative_atomic64(dec_return, "=&A" (a),
"S" (v) : "memory", "ecx");
return a;
@ -176,7 +175,7 @@ static inline long long arch_atomic64_dec_return(atomic64_t *v)
*
* Atomically adds @i to @v.
*/
static inline long long arch_atomic64_add(long long i, atomic64_t *v)
static inline s64 arch_atomic64_add(s64 i, atomic64_t *v)
{
__alternative_atomic64(add, add_return,
ASM_OUTPUT2("+A" (i), "+c" (v)),
@ -191,7 +190,7 @@ static inline long long arch_atomic64_add(long long i, atomic64_t *v)
*
* Atomically subtracts @i from @v.
*/
static inline long long arch_atomic64_sub(long long i, atomic64_t *v)
static inline s64 arch_atomic64_sub(s64 i, atomic64_t *v)
{
__alternative_atomic64(sub, sub_return,
ASM_OUTPUT2("+A" (i), "+c" (v)),
@ -234,8 +233,7 @@ static inline void arch_atomic64_dec(atomic64_t *v)
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if the add was done, zero otherwise.
*/
static inline int arch_atomic64_add_unless(atomic64_t *v, long long a,
long long u)
static inline int arch_atomic64_add_unless(atomic64_t *v, s64 a, s64 u)
{
unsigned low = (unsigned)u;
unsigned high = (unsigned)(u >> 32);
@ -254,9 +252,9 @@ static inline int arch_atomic64_inc_not_zero(atomic64_t *v)
}
#define arch_atomic64_inc_not_zero arch_atomic64_inc_not_zero
static inline long long arch_atomic64_dec_if_positive(atomic64_t *v)
static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
{
long long r;
s64 r;
alternative_atomic64(dec_if_positive, "=&A" (r),
"S" (v) : "ecx", "memory");
return r;
@ -266,17 +264,17 @@ static inline long long arch_atomic64_dec_if_positive(atomic64_t *v)
#undef alternative_atomic64
#undef __alternative_atomic64
static inline void arch_atomic64_and(long long i, atomic64_t *v)
static inline void arch_atomic64_and(s64 i, atomic64_t *v)
{
long long old, c = 0;
s64 old, c = 0;
while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
c = old;
}
static inline long long arch_atomic64_fetch_and(long long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
{
long long old, c = 0;
s64 old, c = 0;
while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
c = old;
@ -284,17 +282,17 @@ static inline long long arch_atomic64_fetch_and(long long i, atomic64_t *v)
return old;
}
static inline void arch_atomic64_or(long long i, atomic64_t *v)
static inline void arch_atomic64_or(s64 i, atomic64_t *v)
{
long long old, c = 0;
s64 old, c = 0;
while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
c = old;
}
static inline long long arch_atomic64_fetch_or(long long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
{
long long old, c = 0;
s64 old, c = 0;
while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
c = old;
@ -302,17 +300,17 @@ static inline long long arch_atomic64_fetch_or(long long i, atomic64_t *v)
return old;
}
static inline void arch_atomic64_xor(long long i, atomic64_t *v)
static inline void arch_atomic64_xor(s64 i, atomic64_t *v)
{
long long old, c = 0;
s64 old, c = 0;
while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
c = old;
}
static inline long long arch_atomic64_fetch_xor(long long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
{
long long old, c = 0;
s64 old, c = 0;
while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
c = old;
@ -320,9 +318,9 @@ static inline long long arch_atomic64_fetch_xor(long long i, atomic64_t *v)
return old;
}
static inline long long arch_atomic64_fetch_add(long long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v)
{
long long old, c = 0;
s64 old, c = 0;
while ((old = arch_atomic64_cmpxchg(v, c, c + i)) != c)
c = old;

46
arch/x86/include/asm/atomic64_64.h
View File

@ -17,7 +17,7 @@
* Atomically reads the value of @v.
* Doesn't imply a read memory barrier.
*/
static inline long arch_atomic64_read(const atomic64_t *v)
static inline s64 arch_atomic64_read(const atomic64_t *v)
{
return READ_ONCE((v)->counter);
}
@ -29,7 +29,7 @@ static inline long arch_atomic64_read(const atomic64_t *v)
*
* Atomically sets the value of @v to @i.
*/
static inline void arch_atomic64_set(atomic64_t *v, long i)
static inline void arch_atomic64_set(atomic64_t *v, s64 i)
{
WRITE_ONCE(v->counter, i);
}
@ -41,11 +41,11 @@ static inline void arch_atomic64_set(atomic64_t *v, long i)
*
* Atomically adds @i to @v.
*/
static __always_inline void arch_atomic64_add(long i, atomic64_t *v)
static __always_inline void arch_atomic64_add(s64 i, atomic64_t *v)
{
asm volatile(LOCK_PREFIX "addq %1,%0"
: "=m" (v->counter)
: "er" (i), "m" (v->counter));
: "er" (i), "m" (v->counter) : "memory");
}
/**
@ -55,11 +55,11 @@ static __always_inline void arch_atomic64_add(long i, atomic64_t *v)
*
* Atomically subtracts @i from @v.
*/
static inline void arch_atomic64_sub(long i, atomic64_t *v)
static inline void arch_atomic64_sub(s64 i, atomic64_t *v)
{
asm volatile(LOCK_PREFIX "subq %1,%0"
: "=m" (v->counter)
: "er" (i), "m" (v->counter));
: "er" (i), "m" (v->counter) : "memory");
}
/**
@ -71,7 +71,7 @@ static inline void arch_atomic64_sub(long i, atomic64_t *v)
* true if the result is zero, or false for all
* other cases.
*/
static inline bool arch_atomic64_sub_and_test(long i, atomic64_t *v)
static inline bool arch_atomic64_sub_and_test(s64 i, atomic64_t *v)
{
return GEN_BINARY_RMWcc(LOCK_PREFIX "subq", v->counter, e, "er", i);
}
@ -87,7 +87,7 @@ static __always_inline void arch_atomic64_inc(atomic64_t *v)
{
asm volatile(LOCK_PREFIX "incq %0"
: "=m" (v->counter)
: "m" (v->counter));
: "m" (v->counter) : "memory");
}
#define arch_atomic64_inc arch_atomic64_inc
@ -101,7 +101,7 @@ static __always_inline void arch_atomic64_dec(atomic64_t *v)
{
asm volatile(LOCK_PREFIX "decq %0"
: "=m" (v->counter)
: "m" (v->counter));
: "m" (v->counter) : "memory");
}
#define arch_atomic64_dec arch_atomic64_dec
@ -142,7 +142,7 @@ static inline bool arch_atomic64_inc_and_test(atomic64_t *v)
* if the result is negative, or false when
* result is greater than or equal to zero.
*/
static inline bool arch_atomic64_add_negative(long i, atomic64_t *v)
static inline bool arch_atomic64_add_negative(s64 i, atomic64_t *v)
{
return GEN_BINARY_RMWcc(LOCK_PREFIX "addq", v->counter, s, "er", i);
}
@ -155,43 +155,43 @@ static inline bool arch_atomic64_add_negative(long i, atomic64_t *v)
*
* Atomically adds @i to @v and returns @i + @v
*/
static __always_inline long arch_atomic64_add_return(long i, atomic64_t *v)
static __always_inline s64 arch_atomic64_add_return(s64 i, atomic64_t *v)
{
return i + xadd(&v->counter, i);
}
static inline long arch_atomic64_sub_return(long i, atomic64_t *v)
static inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v)
{
return arch_atomic64_add_return(-i, v);
}
static inline long arch_atomic64_fetch_add(long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v)
{
return xadd(&v->counter, i);
}
static inline long arch_atomic64_fetch_sub(long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_sub(s64 i, atomic64_t *v)
{
return xadd(&v->counter, -i);
}
static inline long arch_atomic64_cmpxchg(atomic64_t *v, long old, long new)
static inline s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new)
{
return arch_cmpxchg(&v->counter, old, new);
}
#define arch_atomic64_try_cmpxchg arch_atomic64_try_cmpxchg
static __always_inline bool arch_atomic64_try_cmpxchg(atomic64_t *v, s64 *old, long new)
static __always_inline bool arch_atomic64_try_cmpxchg(atomic64_t *v, s64 *old, s64 new)
{
return try_cmpxchg(&v->counter, old, new);
}
static inline long arch_atomic64_xchg(atomic64_t *v, long new)
static inline s64 arch_atomic64_xchg(atomic64_t *v, s64 new)
{
return arch_xchg(&v->counter, new);
}
static inline void arch_atomic64_and(long i, atomic64_t *v)
static inline void arch_atomic64_and(s64 i, atomic64_t *v)
{
asm volatile(LOCK_PREFIX "andq %1,%0"
: "+m" (v->counter)
@ -199,7 +199,7 @@ static inline void arch_atomic64_and(long i, atomic64_t *v)
: "memory");
}
static inline long arch_atomic64_fetch_and(long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
{
s64 val = arch_atomic64_read(v);
@ -208,7 +208,7 @@ static inline long arch_atomic64_fetch_and(long i, atomic64_t *v)
return val;
}
static inline void arch_atomic64_or(long i, atomic64_t *v)
static inline void arch_atomic64_or(s64 i, atomic64_t *v)
{
asm volatile(LOCK_PREFIX "orq %1,%0"
: "+m" (v->counter)
@ -216,7 +216,7 @@ static inline void arch_atomic64_or(long i, atomic64_t *v)
: "memory");
}
static inline long arch_atomic64_fetch_or(long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
{
s64 val = arch_atomic64_read(v);
@ -225,7 +225,7 @@ static inline long arch_atomic64_fetch_or(long i, atomic64_t *v)
return val;
}
static inline void arch_atomic64_xor(long i, atomic64_t *v)
static inline void arch_atomic64_xor(s64 i, atomic64_t *v)
{
asm volatile(LOCK_PREFIX "xorq %1,%0"
: "+m" (v->counter)
@ -233,7 +233,7 @@ static inline void arch_atomic64_xor(long i, atomic64_t *v)
: "memory");
}
static inline long arch_atomic64_fetch_xor(long i, atomic64_t *v)
static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
{
s64 val = arch_atomic64_read(v);

4
arch/x86/include/asm/barrier.h
View File

@ -80,8 +80,8 @@ do { \
})
/* Atomic operations are already serializing on x86 */
#define __smp_mb__before_atomic() barrier()
#define __smp_mb__after_atomic() barrier()
#define __smp_mb__before_atomic() do { } while (0)
#define __smp_mb__after_atomic() do { } while (0)
#include <asm-generic/barrier.h>

4
arch/x86/include/asm/irq_regs.h
View File

@ -16,7 +16,7 @@ DECLARE_PER_CPU(struct pt_regs *, irq_regs);
static inline struct pt_regs *get_irq_regs(void)
{
return this_cpu_read(irq_regs);
return __this_cpu_read(irq_regs);
}
static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
@ -24,7 +24,7 @@ static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
struct pt_regs *old_regs;
old_regs = get_irq_regs();
this_cpu_write(irq_regs, new_regs);
__this_cpu_write(irq_regs, new_regs);
return old_regs;
}

2
arch/x86/include/asm/jump_label.h
View File

@ -2,6 +2,8 @@
#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_H
#define HAVE_JUMP_LABEL_BATCH
#define JUMP_LABEL_NOP_SIZE 5
#ifdef CONFIG_X86_64

226
arch/x86/include/asm/percpu.h
View File

@ -87,7 +87,7 @@
* don't give an lvalue though). */
extern void __bad_percpu_size(void);
#define percpu_to_op(op, var, val) \
#define percpu_to_op(qual, op, var, val) \
do { \
typedef typeof(var) pto_T__; \
if (0) { \
@ -97,22 +97,22 @@ do { \
} \
switch (sizeof(var)) { \
case 1: \
asm(op "b %1,"__percpu_arg(0) \
asm qual (op "b %1,"__percpu_arg(0) \
: "+m" (var) \
: "qi" ((pto_T__)(val))); \
break; \
case 2: \
asm(op "w %1,"__percpu_arg(0) \
asm qual (op "w %1,"__percpu_arg(0) \
: "+m" (var) \
: "ri" ((pto_T__)(val))); \
break; \
case 4: \
asm(op "l %1,"__percpu_arg(0) \
asm qual (op "l %1,"__percpu_arg(0) \
: "+m" (var) \
: "ri" ((pto_T__)(val))); \
break; \
case 8: \
asm(op "q %1,"__percpu_arg(0) \
asm qual (op "q %1,"__percpu_arg(0) \
: "+m" (var) \
: "re" ((pto_T__)(val))); \
break; \
@ -124,7 +124,7 @@ do { \
* Generate a percpu add to memory instruction and optimize code
* if one is added or subtracted.
*/
#define percpu_add_op(var, val) \
#define percpu_add_op(qual, var, val) \
do { \
typedef typeof(var) pao_T__; \
const int pao_ID__ = (__builtin_constant_p(val) && \
@ -138,41 +138,41 @@ do { \
switch (sizeof(var)) { \
case 1: \
if (pao_ID__ == 1) \
asm("incb "__percpu_arg(0) : "+m" (var)); \
asm qual ("incb "__percpu_arg(0) : "+m" (var)); \
else if (pao_ID__ == -1) \
asm("decb "__percpu_arg(0) : "+m" (var)); \
asm qual ("decb "__percpu_arg(0) : "+m" (var)); \
else \
asm("addb %1, "__percpu_arg(0) \
asm qual ("addb %1, "__percpu_arg(0) \
: "+m" (var) \
: "qi" ((pao_T__)(val))); \
break; \
case 2: \
if (pao_ID__ == 1) \
asm("incw "__percpu_arg(0) : "+m" (var)); \
asm qual ("incw "__percpu_arg(0) : "+m" (var)); \
else if (pao_ID__ == -1) \
asm("decw "__percpu_arg(0) : "+m" (var)); \
asm qual ("decw "__percpu_arg(0) : "+m" (var)); \
else \
asm("addw %1, "__percpu_arg(0) \
asm qual ("addw %1, "__percpu_arg(0) \
: "+m" (var) \
: "ri" ((pao_T__)(val))); \
break; \
case 4: \
if (pao_ID__ == 1) \
asm("incl "__percpu_arg(0) : "+m" (var)); \
asm qual ("incl "__percpu_arg(0) : "+m" (var)); \
else if (pao_ID__ == -1) \
asm("decl "__percpu_arg(0) : "+m" (var)); \
asm qual ("decl "__percpu_arg(0) : "+m" (var)); \
else \
asm("addl %1, "__percpu_arg(0) \
asm qual ("addl %1, "__percpu_arg(0) \
: "+m" (var) \
: "ri" ((pao_T__)(val))); \
break; \
case 8: \
if (pao_ID__ == 1) \
asm("incq "__percpu_arg(0) : "+m" (var)); \
asm qual ("incq "__percpu_arg(0) : "+m" (var)); \
else if (pao_ID__ == -1) \
asm("decq "__percpu_arg(0) : "+m" (var)); \
asm qual ("decq "__percpu_arg(0) : "+m" (var)); \
else \
asm("addq %1, "__percpu_arg(0) \
asm qual ("addq %1, "__percpu_arg(0) \
: "+m" (var) \
: "re" ((pao_T__)(val))); \
break; \
@ -180,27 +180,27 @@ do { \
} \
} while (0)
#define percpu_from_op(op, var) \
#define percpu_from_op(qual, op, var) \
({ \
typeof(var) pfo_ret__; \
switch (sizeof(var)) { \
case 1: \
asm volatile(op "b "__percpu_arg(1)",%0"\
asm qual (op "b "__percpu_arg(1)",%0" \
: "=q" (pfo_ret__) \
: "m" (var)); \
break; \
case 2: \
asm volatile(op "w "__percpu_arg(1)",%0"\
asm qual (op "w "__percpu_arg(1)",%0" \
: "=r" (pfo_ret__) \
: "m" (var)); \
break; \
case 4: \
asm volatile(op "l "__percpu_arg(1)",%0"\
asm qual (op "l "__percpu_arg(1)",%0" \
: "=r" (pfo_ret__) \
: "m" (var)); \
break; \
case 8: \
asm volatile(op "q "__percpu_arg(1)",%0"\
asm qual (op "q "__percpu_arg(1)",%0" \
: "=r" (pfo_ret__) \
: "m" (var)); \
break; \
@ -238,23 +238,23 @@ do { \
pfo_ret__; \
})
#define percpu_unary_op(op, var) \
#define percpu_unary_op(qual, op, var) \
({ \
switch (sizeof(var)) { \
case 1: \
asm(op "b "__percpu_arg(0) \
asm qual (op "b "__percpu_arg(0) \
: "+m" (var)); \
break; \
case 2: \
asm(op "w "__percpu_arg(0) \
asm qual (op "w "__percpu_arg(0) \
: "+m" (var)); \
break; \
case 4: \
asm(op "l "__percpu_arg(0) \
asm qual (op "l "__percpu_arg(0) \
: "+m" (var)); \
break; \
case 8: \
asm(op "q "__percpu_arg(0) \
asm qual (op "q "__percpu_arg(0) \
: "+m" (var)); \
break; \
default: __bad_percpu_size(); \
@ -264,27 +264,27 @@ do { \
/*
* Add return operation
*/
#define percpu_add_return_op(var, val) \
#define percpu_add_return_op(qual, var, val) \
({ \
typeof(var) paro_ret__ = val; \
switch (sizeof(var)) { \
case 1: \
asm("xaddb %0, "__percpu_arg(1) \
asm qual ("xaddb %0, "__percpu_arg(1) \
: "+q" (paro_ret__), "+m" (var) \
: : "memory"); \
break; \
case 2: \
asm("xaddw %0, "__percpu_arg(1) \
asm qual ("xaddw %0, "__percpu_arg(1) \
: "+r" (paro_ret__), "+m" (var) \
: : "memory"); \
break; \
case 4: \
asm("xaddl %0, "__percpu_arg(1) \
asm qual ("xaddl %0, "__percpu_arg(1) \
: "+r" (paro_ret__), "+m" (var) \
: : "memory"); \
break; \
case 8: \
asm("xaddq %0, "__percpu_arg(1) \
asm qual ("xaddq %0, "__percpu_arg(1) \
: "+re" (paro_ret__), "+m" (var) \
: : "memory"); \
break; \
@ -299,13 +299,13 @@ do { \
* expensive due to the implied lock prefix. The processor cannot prefetch
* cachelines if xchg is used.
*/
#define percpu_xchg_op(var, nval) \
#define percpu_xchg_op(qual, var, nval) \
({ \
typeof(var) pxo_ret__; \
typeof(var) pxo_new__ = (nval); \
switch (sizeof(var)) { \
case 1: \
asm("\n\tmov "__percpu_arg(1)",%%al" \
asm qual ("\n\tmov "__percpu_arg(1)",%%al" \
"\n1:\tcmpxchgb %2, "__percpu_arg(1) \
"\n\tjnz 1b" \
: "=&a" (pxo_ret__), "+m" (var) \
@ -313,7 +313,7 @@ do { \
: "memory"); \
break; \
case 2: \
asm("\n\tmov "__percpu_arg(1)",%%ax" \
asm qual ("\n\tmov "__percpu_arg(1)",%%ax" \
"\n1:\tcmpxchgw %2, "__percpu_arg(1) \
"\n\tjnz 1b" \
: "=&a" (pxo_ret__), "+m" (var) \
@ -321,7 +321,7 @@ do { \
: "memory"); \
break; \
case 4: \
asm("\n\tmov "__percpu_arg(1)",%%eax" \
asm qual ("\n\tmov "__percpu_arg(1)",%%eax" \
"\n1:\tcmpxchgl %2, "__percpu_arg(1) \
"\n\tjnz 1b" \
: "=&a" (pxo_ret__), "+m" (var) \
@ -329,7 +329,7 @@ do { \
: "memory"); \
break; \
case 8: \
asm("\n\tmov "__percpu_arg(1)",%%rax" \
asm qual ("\n\tmov "__percpu_arg(1)",%%rax" \
"\n1:\tcmpxchgq %2, "__percpu_arg(1) \
"\n\tjnz 1b" \
: "=&a" (pxo_ret__), "+m" (var) \
@ -345,32 +345,32 @@ do { \
* cmpxchg has no such implied lock semantics as a result it is much
* more efficient for cpu local operations.
*/
#define percpu_cmpxchg_op(var, oval, nval) \
#define percpu_cmpxchg_op(qual, var, oval, nval) \
({ \
typeof(var) pco_ret__; \
typeof(var) pco_old__ = (oval); \
typeof(var) pco_new__ = (nval); \
switch (sizeof(var)) { \
case 1: \
asm("cmpxchgb %2, "__percpu_arg(1) \
asm qual ("cmpxchgb %2, "__percpu_arg(1) \
: "=a" (pco_ret__), "+m" (var) \
: "q" (pco_new__), "0" (pco_old__) \
: "memory"); \
break; \
case 2: \
asm("cmpxchgw %2, "__percpu_arg(1) \
asm qual ("cmpxchgw %2, "__percpu_arg(1) \
: "=a" (pco_ret__), "+m" (var) \
: "r" (pco_new__), "0" (pco_old__) \
: "memory"); \
break; \
case 4: \
asm("cmpxchgl %2, "__percpu_arg(1) \
asm qual ("cmpxchgl %2, "__percpu_arg(1) \
: "=a" (pco_ret__), "+m" (var) \
: "r" (pco_new__), "0" (pco_old__) \
: "memory"); \
break; \
case 8: \
asm("cmpxchgq %2, "__percpu_arg(1) \
asm qual ("cmpxchgq %2, "__percpu_arg(1) \
: "=a" (pco_ret__), "+m" (var) \
: "r" (pco_new__), "0" (pco_old__) \
: "memory"); \
@ -391,58 +391,70 @@ do { \
*/
#define this_cpu_read_stable(var) percpu_stable_op("mov", var)
#define raw_cpu_read_1(pcp) percpu_from_op("mov", pcp)
#define raw_cpu_read_2(pcp) percpu_from_op("mov", pcp)
#define raw_cpu_read_4(pcp) percpu_from_op("mov", pcp)
#define raw_cpu_read_1(pcp) percpu_from_op(, "mov", pcp)
#define raw_cpu_read_2(pcp) percpu_from_op(, "mov", pcp)
#define raw_cpu_read_4(pcp) percpu_from_op(, "mov", pcp)
#define raw_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
#define raw_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
#define raw_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
#define raw_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
#define raw_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
#define raw_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
#define raw_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
#define raw_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
#define raw_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
#define raw_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
#define raw_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
#define raw_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
#define raw_cpu_xchg_1(pcp, val) percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_2(pcp, val) percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_4(pcp, val) percpu_xchg_op(pcp, val)
#define raw_cpu_write_1(pcp, val) percpu_to_op(, "mov", (pcp), val)
#define raw_cpu_write_2(pcp, val) percpu_to_op(, "mov", (pcp), val)
#define raw_cpu_write_4(pcp, val) percpu_to_op(, "mov", (pcp), val)
#define raw_cpu_add_1(pcp, val) percpu_add_op(, (pcp), val)
#define raw_cpu_add_2(pcp, val) percpu_add_op(, (pcp), val)
#define raw_cpu_add_4(pcp, val) percpu_add_op(, (pcp), val)
#define raw_cpu_and_1(pcp, val) percpu_to_op(, "and", (pcp), val)
#define raw_cpu_and_2(pcp, val) percpu_to_op(, "and", (pcp), val)
#define raw_cpu_and_4(pcp, val) percpu_to_op(, "and", (pcp), val)
#define raw_cpu_or_1(pcp, val) percpu_to_op(, "or", (pcp), val)
#define raw_cpu_or_2(pcp, val) percpu_to_op(, "or", (pcp), val)
#define raw_cpu_or_4(pcp, val) percpu_to_op(, "or", (pcp), val)
#define this_cpu_read_1(pcp) percpu_from_op("mov", pcp)
#define this_cpu_read_2(pcp) percpu_from_op("mov", pcp)
#define this_cpu_read_4(pcp) percpu_from_op("mov", pcp)
#define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
#define this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
#define this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
#define this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
#define this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
#define this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
#define this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
#define this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
#define this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
#define this_cpu_xchg_1(pcp, nval) percpu_xchg_op(pcp, nval)
#define this_cpu_xchg_2(pcp, nval) percpu_xchg_op(pcp, nval)
#define this_cpu_xchg_4(pcp, nval) percpu_xchg_op(pcp, nval)
/*
* raw_cpu_xchg() can use a load-store since it is not required to be
* IRQ-safe.
*/
#define raw_percpu_xchg_op(var, nval) \
({ \
typeof(var) pxo_ret__ = raw_cpu_read(var); \
raw_cpu_write(var, (nval)); \
pxo_ret__; \
})
#define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
#define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
#define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
#define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define raw_cpu_xchg_1(pcp, val) raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val)
#define this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
#define this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
#define this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
#define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define this_cpu_read_1(pcp) percpu_from_op(volatile, "mov", pcp)
#define this_cpu_read_2(pcp) percpu_from_op(volatile, "mov", pcp)
#define this_cpu_read_4(pcp) percpu_from_op(volatile, "mov", pcp)
#define this_cpu_write_1(pcp, val) percpu_to_op(volatile, "mov", (pcp), val)
#define this_cpu_write_2(pcp, val) percpu_to_op(volatile, "mov", (pcp), val)
#define this_cpu_write_4(pcp, val) percpu_to_op(volatile, "mov", (pcp), val)
#define this_cpu_add_1(pcp, val) percpu_add_op(volatile, (pcp), val)
#define this_cpu_add_2(pcp, val) percpu_add_op(volatile, (pcp), val)
#define this_cpu_add_4(pcp, val) percpu_add_op(volatile, (pcp), val)
#define this_cpu_and_1(pcp, val) percpu_to_op(volatile, "and", (pcp), val)
#define this_cpu_and_2(pcp, val) percpu_to_op(volatile, "and", (pcp), val)
#define this_cpu_and_4(pcp, val) percpu_to_op(volatile, "and", (pcp), val)
#define this_cpu_or_1(pcp, val) percpu_to_op(volatile, "or", (pcp), val)
#define this_cpu_or_2(pcp, val) percpu_to_op(volatile, "or", (pcp), val)
#define this_cpu_or_4(pcp, val) percpu_to_op(volatile, "or", (pcp), val)
#define this_cpu_xchg_1(pcp, nval) percpu_xchg_op(volatile, pcp, nval)
#define this_cpu_xchg_2(pcp, nval) percpu_xchg_op(volatile, pcp, nval)
#define this_cpu_xchg_4(pcp, nval) percpu_xchg_op(volatile, pcp, nval)
#define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(, pcp, val)
#define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(, pcp, val)
#define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(, pcp, val)
#define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(, pcp, oval, nval)
#define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(, pcp, oval, nval)
#define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(, pcp, oval, nval)
#define this_cpu_add_return_1(pcp, val) percpu_add_return_op(volatile, pcp, val)
#define this_cpu_add_return_2(pcp, val) percpu_add_return_op(volatile, pcp, val)
#define this_cpu_add_return_4(pcp, val) percpu_add_return_op(volatile, pcp, val)
#define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(volatile, pcp, oval, nval)
#define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(volatile, pcp, oval, nval)
#define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(volatile, pcp, oval, nval)
#ifdef CONFIG_X86_CMPXCHG64
#define percpu_cmpxchg8b_double(pcp1, pcp2, o1, o2, n1, n2) \
@ -466,23 +478,23 @@ do { \
* 32 bit must fall back to generic operations.
*/
#ifdef CONFIG_X86_64
#define raw_cpu_read_8(pcp) percpu_from_op("mov", pcp)
#define raw_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
#define raw_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
#define raw_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
#define raw_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
#define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
#define raw_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval)
#define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define raw_cpu_read_8(pcp) percpu_from_op(, "mov", pcp)
#define raw_cpu_write_8(pcp, val) percpu_to_op(, "mov", (pcp), val)
#define raw_cpu_add_8(pcp, val) percpu_add_op(, (pcp), val)
#define raw_cpu_and_8(pcp, val) percpu_to_op(, "and", (pcp), val)
#define raw_cpu_or_8(pcp, val) percpu_to_op(, "or", (pcp), val)
#define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(, pcp, val)
#define raw_cpu_xchg_8(pcp, nval) raw_percpu_xchg_op(pcp, nval)
#define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(, pcp, oval, nval)
#define this_cpu_read_8(pcp) percpu_from_op("mov", pcp)
#define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
#define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
#define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
#define this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
#define this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval)
#define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
#define this_cpu_read_8(pcp) percpu_from_op(volatile, "mov", pcp)
#define this_cpu_write_8(pcp, val) percpu_to_op(volatile, "mov", (pcp), val)
#define this_cpu_add_8(pcp, val) percpu_add_op(volatile, (pcp), val)
#define this_cpu_and_8(pcp, val) percpu_to_op(volatile, "and", (pcp), val)
#define this_cpu_or_8(pcp, val) percpu_to_op(volatile, "or", (pcp), val)
#define this_cpu_add_return_8(pcp, val) percpu_add_return_op(volatile, pcp, val)
#define this_cpu_xchg_8(pcp, nval) percpu_xchg_op(volatile, pcp, nval)
#define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(volatile, pcp, oval, nval)
/*
* Pretty complex macro to generate cmpxchg16 instruction. The instruction

3
arch/x86/include/asm/smp.h
View File

@ -162,7 +162,8 @@ __visible void smp_call_function_single_interrupt(struct pt_regs *r);
* from the initial startup. We map APIC_BASE very early in page_setup(),
* so this is correct in the x86 case.
*/
#define raw_smp_processor_id() (this_cpu_read(cpu_number))
#define raw_smp_processor_id() this_cpu_read(cpu_number)
#define __smp_processor_id() __this_cpu_read(cpu_number)
#ifdef CONFIG_X86_32
extern int safe_smp_processor_id(void);

15
arch/x86/include/asm/text-patching.h
View File

@ -18,6 +18,20 @@ static inline void apply_paravirt(struct paravirt_patch_site *start,
#define __parainstructions_end NULL
#endif
/*
* Currently, the max observed size in the kernel code is
* JUMP_LABEL_NOP_SIZE/RELATIVEJUMP_SIZE, which are 5.
* Raise it if needed.
*/
#define POKE_MAX_OPCODE_SIZE 5
struct text_poke_loc {
void *detour;
void *addr;
size_t len;
const char opcode[POKE_MAX_OPCODE_SIZE];
};
extern void text_poke_early(void *addr, const void *opcode, size_t len);
/*
@ -38,6 +52,7 @@ extern void *text_poke(void *addr, const void *opcode, size_t len);
extern void *text_poke_kgdb(void *addr, const void *opcode, size_t len);
extern int poke_int3_handler(struct pt_regs *regs);
extern void text_poke_bp(void *addr, const void *opcode, size_t len, void *handler);
extern void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries);
extern int after_bootmem;
extern __ro_after_init struct mm_struct *poking_mm;
extern __ro_after_init unsigned long poking_addr;

154
arch/x86/kernel/alternative.c
View File

@ -14,6 +14,7 @@
#include <linux/kdebug.h>
#include <linux/kprobes.h>
#include <linux/mmu_context.h>
#include <linux/bsearch.h>
#include <asm/text-patching.h>
#include <asm/alternative.h>
#include <asm/sections.h>
@ -848,81 +849,133 @@ static void do_sync_core(void *info)
sync_core();
}
static bool bp_patching_in_progress;
static void *bp_int3_handler, *bp_int3_addr;
static struct bp_patching_desc {
struct text_poke_loc *vec;
int nr_entries;
} bp_patching;
static int patch_cmp(const void *key, const void *elt)
{
struct text_poke_loc *tp = (struct text_poke_loc *) elt;
if (key < tp->addr)
return -1;
if (key > tp->addr)
return 1;
return 0;
}
NOKPROBE_SYMBOL(patch_cmp);
int poke_int3_handler(struct pt_regs *regs)
{
struct text_poke_loc *tp;
unsigned char int3 = 0xcc;
void *ip;
/*
* Having observed our INT3 instruction, we now must observe
* bp_patching_in_progress.
* bp_patching.nr_entries.
*
* in_progress = TRUE INT3
* nr_entries != 0 INT3
* WMB RMB
* write INT3 if (in_progress)
* write INT3 if (nr_entries)
*
* Idem for bp_int3_handler.
* Idem for other elements in bp_patching.
*/
smp_rmb();
if (likely(!bp_patching_in_progress))
if (likely(!bp_patching.nr_entries))
return 0;
if (user_mode(regs) || regs->ip != (unsigned long)bp_int3_addr)
if (user_mode(regs))
return 0;
/* set up the specified breakpoint handler */
regs->ip = (unsigned long) bp_int3_handler;
/*
* Discount the sizeof(int3). See text_poke_bp_batch().
*/
ip = (void *) regs->ip - sizeof(int3);
/*
* Skip the binary search if there is a single member in the vector.
*/
if (unlikely(bp_patching.nr_entries > 1)) {
tp = bsearch(ip, bp_patching.vec, bp_patching.nr_entries,
sizeof(struct text_poke_loc),
patch_cmp);
if (!tp)
return 0;
} else {
tp = bp_patching.vec;
if (tp->addr != ip)
return 0;
}
/* set up the specified breakpoint detour */
regs->ip = (unsigned long) tp->detour;
return 1;
}
NOKPROBE_SYMBOL(poke_int3_handler);
/**
* text_poke_bp() -- update instructions on live kernel on SMP
* @addr: address to patch
* @opcode: opcode of new instruction
* @len: length to copy
* @handler: address to jump to when the temporary breakpoint is hit
* text_poke_bp_batch() -- update instructions on live kernel on SMP
* @tp: vector of instructions to patch
* @nr_entries: number of entries in the vector
*
* Modify multi-byte instruction by using int3 breakpoint on SMP.
* We completely avoid stop_machine() here, and achieve the
* synchronization using int3 breakpoint.
*
* The way it is done:
* - add a int3 trap to the address that will be patched
* - For each entry in the vector:
* - add a int3 trap to the address that will be patched
* - sync cores
* - update all but the first byte of the patched range
* - For each entry in the vector:
* - update all but the first byte of the patched range
* - sync cores
* - replace the first byte (int3) by the first byte of
* replacing opcode
* - For each entry in the vector:
* - replace the first byte (int3) by the first byte of
* replacing opcode
* - sync cores
*/
void text_poke_bp(void *addr, const void *opcode, size_t len, void *handler)
void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries)
{
int patched_all_but_first = 0;
unsigned char int3 = 0xcc;
bp_int3_handler = handler;
bp_int3_addr = (u8 *)addr + sizeof(int3);
bp_patching_in_progress = true;
unsigned int i;
lockdep_assert_held(&text_mutex);
bp_patching.vec = tp;
bp_patching.nr_entries = nr_entries;
/*
* Corresponding read barrier in int3 notifier for making sure the
* in_progress and handler are correctly ordered wrt. patching.
* nr_entries and handler are correctly ordered wrt. patching.
*/
smp_wmb();
text_poke(addr, &int3, sizeof(int3));
/*
* First step: add a int3 trap to the address that will be patched.
*/
for (i = 0; i < nr_entries; i++)
text_poke(tp[i].addr, &int3, sizeof(int3));
on_each_cpu(do_sync_core, NULL, 1);
if (len - sizeof(int3) > 0) {
/* patch all but the first byte */
text_poke((char *)addr + sizeof(int3),
(const char *) opcode + sizeof(int3),
len - sizeof(int3));
/*
* Second step: update all but the first byte of the patched range.
*/
for (i = 0; i < nr_entries; i++) {
if (tp[i].len - sizeof(int3) > 0) {
text_poke((char *)tp[i].addr + sizeof(int3),
(const char *)tp[i].opcode + sizeof(int3),
tp[i].len - sizeof(int3));
patched_all_but_first++;
}
}
if (patched_all_but_first) {
/*
* According to Intel, this core syncing is very likely
* not necessary and we'd be safe even without it. But
@ -931,14 +984,47 @@ void text_poke_bp(void *addr, const void *opcode, size_t len, void *handler)
on_each_cpu(do_sync_core, NULL, 1);
}
/* patch the first byte */
text_poke(addr, opcode, sizeof(int3));
/*
* Third step: replace the first byte (int3) by the first byte of
* replacing opcode.
*/
for (i = 0; i < nr_entries; i++)
text_poke(tp[i].addr, tp[i].opcode, sizeof(int3));
on_each_cpu(do_sync_core, NULL, 1);
/*
* sync_core() implies an smp_mb() and orders this store against
* the writing of the new instruction.
*/
bp_patching_in_progress = false;
bp_patching.vec = NULL;
bp_patching.nr_entries = 0;
}
/**
* text_poke_bp() -- update instructions on live kernel on SMP
* @addr: address to patch
* @opcode: opcode of new instruction
* @len: length to copy
* @handler: address to jump to when the temporary breakpoint is hit
*
* Update a single instruction with the vector in the stack, avoiding
* dynamically allocated memory. This function should be used when it is
* not possible to allocate memory.
*/
void text_poke_bp(void *addr, const void *opcode, size_t len, void *handler)
{
struct text_poke_loc tp = {
.detour = handler,
.addr = addr,
.len = len,
};
if (len > POKE_MAX_OPCODE_SIZE) {
WARN_ONCE(1, "len is larger than %d\n", POKE_MAX_OPCODE_SIZE);
return;
}
memcpy((void *)tp.opcode, opcode, len);
text_poke_bp_batch(&tp, 1);
}

121
arch/x86/kernel/jump_label.c
View File

@ -35,41 +35,43 @@ static void bug_at(unsigned char *ip, int line)
BUG();
}
static void __ref __jump_label_transform(struct jump_entry *entry,
enum jump_label_type type,
int init)
static void __jump_label_set_jump_code(struct jump_entry *entry,
enum jump_label_type type,
union jump_code_union *code,
int init)
{
union jump_code_union jmp;
const unsigned char default_nop[] = { STATIC_KEY_INIT_NOP };
const unsigned char *ideal_nop = ideal_nops[NOP_ATOMIC5];
const void *expect, *code;
const void *expect;
int line;
jmp.jump = 0xe9;
jmp.offset = jump_entry_target(entry) -
(jump_entry_code(entry) + JUMP_LABEL_NOP_SIZE);
code->jump = 0xe9;
code->offset = jump_entry_target(entry) -
(jump_entry_code(entry) + JUMP_LABEL_NOP_SIZE);
if (type == JUMP_LABEL_JMP) {
if (init) {
expect = default_nop; line = __LINE__;
} else {
expect = ideal_nop; line = __LINE__;
}
code = &jmp.code;
if (init) {
expect = default_nop; line = __LINE__;
} else if (type == JUMP_LABEL_JMP) {
expect = ideal_nop; line = __LINE__;
} else {
if (init) {
expect = default_nop; line = __LINE__;
} else {
expect = &jmp.code; line = __LINE__;
}
code = ideal_nop;
expect = code->code; line = __LINE__;
}
if (memcmp((void *)jump_entry_code(entry), expect, JUMP_LABEL_NOP_SIZE))
bug_at((void *)jump_entry_code(entry), line);
if (type == JUMP_LABEL_NOP)
memcpy(code, ideal_nop, JUMP_LABEL_NOP_SIZE);
}
static void __ref __jump_label_transform(struct jump_entry *entry,
enum jump_label_type type,
int init)
{
union jump_code_union code;
__jump_label_set_jump_code(entry, type, &code, init);
/*
* As long as only a single processor is running and the code is still
* not marked as RO, text_poke_early() can be used; Checking that
@ -82,12 +84,12 @@ static void __ref __jump_label_transform(struct jump_entry *entry,
* always nop being the 'currently valid' instruction
*/
if (init || system_state == SYSTEM_BOOTING) {
text_poke_early((void *)jump_entry_code(entry), code,
text_poke_early((void *)jump_entry_code(entry), &code,
JUMP_LABEL_NOP_SIZE);
return;
}
text_poke_bp((void *)jump_entry_code(entry), code, JUMP_LABEL_NOP_SIZE,
text_poke_bp((void *)jump_entry_code(entry), &code, JUMP_LABEL_NOP_SIZE,
(void *)jump_entry_code(entry) + JUMP_LABEL_NOP_SIZE);
}
@ -99,6 +101,75 @@ void arch_jump_label_transform(struct jump_entry *entry,
mutex_unlock(&text_mutex);
}
#define TP_VEC_MAX (PAGE_SIZE / sizeof(struct text_poke_loc))
static struct text_poke_loc tp_vec[TP_VEC_MAX];
static int tp_vec_nr;
bool arch_jump_label_transform_queue(struct jump_entry *entry,
enum jump_label_type type)
{
struct text_poke_loc *tp;
void *entry_code;
if (system_state == SYSTEM_BOOTING) {
/*
* Fallback to the non-batching mode.
*/
arch_jump_label_transform(entry, type);
return true;
}
/*
* No more space in the vector, tell upper layer to apply
* the queue before continuing.
*/
if (tp_vec_nr == TP_VEC_MAX)
return false;
tp = &tp_vec[tp_vec_nr];
entry_code = (void *)jump_entry_code(entry);
/*
* The INT3 handler will do a bsearch in the queue, so we need entries
* to be sorted. We can survive an unsorted list by rejecting the entry,
* forcing the generic jump_label code to apply the queue. Warning once,
* to raise the attention to the case of an unsorted entry that is
* better not happen, because, in the worst case we will perform in the
* same way as we do without batching - with some more overhead.
*/
if (tp_vec_nr > 0) {
int prev = tp_vec_nr - 1;
struct text_poke_loc *prev_tp = &tp_vec[prev];
if (WARN_ON_ONCE(prev_tp->addr > entry_code))
return false;
}
__jump_label_set_jump_code(entry, type,
(union jump_code_union *) &tp->opcode, 0);
tp->addr = entry_code;
tp->detour = entry_code + JUMP_LABEL_NOP_SIZE;
tp->len = JUMP_LABEL_NOP_SIZE;
tp_vec_nr++;
return true;
}
void arch_jump_label_transform_apply(void)
{
if (!tp_vec_nr)
return;
mutex_lock(&text_mutex);
text_poke_bp_batch(tp_vec, tp_vec_nr);
mutex_unlock(&text_mutex);
tp_vec_nr = 0;
}
static enum {
JL_STATE_START,
JL_STATE_NO_UPDATE,

6
drivers/crypto/nx/nx-842-pseries.c
View File

@ -856,7 +856,7 @@ static ssize_t nx842_##_name##_show(struct device *dev, \
rcu_read_lock(); \
local_devdata = rcu_dereference(devdata); \
if (local_devdata) \
p = snprintf(buf, PAGE_SIZE, "%ld\n", \
p = snprintf(buf, PAGE_SIZE, "%lld\n", \
atomic64_read(&local_devdata->counters->_name)); \
rcu_read_unlock(); \
return p; \
@ -909,7 +909,7 @@ static ssize_t nx842_timehist_show(struct device *dev,
}
for (i = 0; i < (NX842_HIST_SLOTS - 2); i++) {
bytes = snprintf(p, bytes_remain, "%u-%uus:\t%ld\n",
bytes = snprintf(p, bytes_remain, "%u-%uus:\t%lld\n",
i ? (2<<(i-1)) : 0, (2<<i)-1,
atomic64_read(&times[i]));
bytes_remain -= bytes;
@ -917,7 +917,7 @@ static ssize_t nx842_timehist_show(struct device *dev,
}
/* The last bucket holds everything over
* 2<<(NX842_HIST_SLOTS - 2) us */
bytes = snprintf(p, bytes_remain, "%uus - :\t%ld\n",
bytes = snprintf(p, bytes_remain, "%uus - :\t%lld\n",
2<<(NX842_HIST_SLOTS - 2),
atomic64_read(&times[(NX842_HIST_SLOTS - 1)]));
p += bytes;

2
drivers/infiniband/core/device.c
View File

@ -457,7 +457,7 @@ static int alloc_name(struct ib_device *ibdev, const char *name)
int rc;
int i;
lockdep_assert_held_exclusive(&devices_rwsem);
lockdep_assert_held_write(&devices_rwsem);
ida_init(&inuse);
xa_for_each (&devices, index, device) {
char buf[IB_DEVICE_NAME_MAX];

8
drivers/tty/tty_ldisc.c
View File

@ -487,7 +487,7 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld)
{
lockdep_assert_held_exclusive(&tty->ldisc_sem);
lockdep_assert_held_write(&tty->ldisc_sem);
WARN_ON(!test_bit(TTY_LDISC_OPEN, &tty->flags));
clear_bit(TTY_LDISC_OPEN, &tty->flags);
if (ld->ops->close)
@ -509,7 +509,7 @@ static int tty_ldisc_failto(struct tty_struct *tty, int ld)
struct tty_ldisc *disc = tty_ldisc_get(tty, ld);
int r;
lockdep_assert_held_exclusive(&tty->ldisc_sem);
lockdep_assert_held_write(&tty->ldisc_sem);
if (IS_ERR(disc))
return PTR_ERR(disc);
tty->ldisc = disc;
@ -633,7 +633,7 @@ EXPORT_SYMBOL_GPL(tty_set_ldisc);
*/
static void tty_ldisc_kill(struct tty_struct *tty)
{
lockdep_assert_held_exclusive(&tty->ldisc_sem);
lockdep_assert_held_write(&tty->ldisc_sem);
if (!tty->ldisc)
return;
/*
@ -681,7 +681,7 @@ int tty_ldisc_reinit(struct tty_struct *tty, int disc)
struct tty_ldisc *ld;
int retval;
lockdep_assert_held_exclusive(&tty->ldisc_sem);
lockdep_assert_held_write(&tty->ldisc_sem);
ld = tty_ldisc_get(tty, disc);
if (IS_ERR(ld)) {
BUG_ON(disc == N_TTY);

2
fs/dax.c
View File

@ -1187,7 +1187,7 @@ dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
unsigned flags = 0;
if (iov_iter_rw(iter) == WRITE) {
lockdep_assert_held_exclusive(&inode->i_rwsem);
lockdep_assert_held_write(&inode->i_rwsem);
flags |= IOMAP_WRITE;
} else {
lockdep_assert_held(&inode->i_rwsem);

20
include/asm-generic/atomic64.h
View File

@ -10,24 +10,24 @@
#include <linux/types.h>
typedef struct {
long long counter;
s64 counter;
} atomic64_t;
#define ATOMIC64_INIT(i) { (i) }
extern long long atomic64_read(const atomic64_t *v);
extern void atomic64_set(atomic64_t *v, long long i);
extern s64 atomic64_read(const atomic64_t *v);
extern void atomic64_set(atomic64_t *v, s64 i);
#define atomic64_set_release(v, i) atomic64_set((v), (i))
#define ATOMIC64_OP(op) \
extern void atomic64_##op(long long a, atomic64_t *v);
extern void atomic64_##op(s64 a, atomic64_t *v);
#define ATOMIC64_OP_RETURN(op) \
extern long long atomic64_##op##_return(long long a, atomic64_t *v);
extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
#define ATOMIC64_FETCH_OP(op) \
extern long long atomic64_fetch_##op(long long a, atomic64_t *v);
extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v);
#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
@ -46,11 +46,11 @@ ATOMIC64_OPS(xor)
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
extern long long atomic64_dec_if_positive(atomic64_t *v);
extern s64 atomic64_dec_if_positive(atomic64_t *v);
#define atomic64_dec_if_positive atomic64_dec_if_positive
extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
extern long long atomic64_xchg(atomic64_t *v, long long new);
extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u);
extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
extern s64 atomic64_xchg(atomic64_t *v, s64 new);
extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
#define atomic64_fetch_add_unless atomic64_fetch_add_unless
#endif /* _ASM_GENERIC_ATOMIC64_H */

3
include/linux/jump_label.h
View File

@ -215,6 +215,9 @@ extern void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type);
extern void arch_jump_label_transform_static(struct jump_entry *entry,
enum jump_label_type type);
extern bool arch_jump_label_transform_queue(struct jump_entry *entry,
enum jump_label_type type);
extern void arch_jump_label_transform_apply(void);
extern int jump_label_text_reserved(void *start, void *end);
extern void static_key_slow_inc(struct static_key *key);
extern void static_key_slow_dec(struct static_key *key);

36
include/linux/lockdep.h
View File

@ -203,11 +203,17 @@ struct lock_list {
struct lock_list *parent;
};
/*
* We record lock dependency chains, so that we can cache them:
/**
* struct lock_chain - lock dependency chain record
*
* @irq_context: the same as irq_context in held_lock below
* @depth: the number of held locks in this chain
* @base: the index in chain_hlocks for this chain
* @entry: the collided lock chains in lock_chain hash list
* @chain_key: the hash key of this lock_chain
*/
struct lock_chain {
/* see BUILD_BUG_ON()s in lookup_chain_cache() */
/* see BUILD_BUG_ON()s in add_chain_cache() */
unsigned int irq_context : 2,
depth : 6,
base : 24;
@ -217,12 +223,8 @@ struct lock_chain {
};
#define MAX_LOCKDEP_KEYS_BITS 13
/*
* Subtract one because we offset hlock->class_idx by 1 in order
* to make 0 mean no class. This avoids overflowing the class_idx
* bitfield and hitting the BUG in hlock_class().
*/
#define MAX_LOCKDEP_KEYS ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1)
#define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
#define INITIAL_CHAIN_KEY -1
struct held_lock {
/*
@ -247,6 +249,11 @@ struct held_lock {
u64 waittime_stamp;
u64 holdtime_stamp;
#endif
/*
* class_idx is zero-indexed; it points to the element in
* lock_classes this held lock instance belongs to. class_idx is in
* the range from 0 to (MAX_LOCKDEP_KEYS-1) inclusive.
*/
unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS;
/*
* The lock-stack is unified in that the lock chains of interrupt
@ -281,6 +288,8 @@ extern void lockdep_free_key_range(void *start, unsigned long size);
extern asmlinkage void lockdep_sys_exit(void);
extern void lockdep_set_selftest_task(struct task_struct *task);
extern void lockdep_init_task(struct task_struct *task);
extern void lockdep_off(void);
extern void lockdep_on(void);
@ -385,7 +394,7 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
WARN_ON(debug_locks && !lockdep_is_held(l)); \
} while (0)
#define lockdep_assert_held_exclusive(l) do { \
#define lockdep_assert_held_write(l) do { \
WARN_ON(debug_locks && !lockdep_is_held_type(l, 0)); \
} while (0)
@ -405,6 +414,10 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
#else /* !CONFIG_LOCKDEP */
static inline void lockdep_init_task(struct task_struct *task)
{
}
static inline void lockdep_off(void)
{
}
@ -466,7 +479,7 @@ struct lockdep_map { };
#define lockdep_is_held_type(l, r) (1)
#define lockdep_assert_held(l) do { (void)(l); } while (0)
#define lockdep_assert_held_exclusive(l) do { (void)(l); } while (0)
#define lockdep_assert_held_write(l) do { (void)(l); } while (0)
#define lockdep_assert_held_read(l) do { (void)(l); } while (0)
#define lockdep_assert_held_once(l) do { (void)(l); } while (0)
@ -497,7 +510,6 @@ enum xhlock_context_t {
{ .name = (_name), .key = (void *)(_key), }
static inline void lockdep_invariant_state(bool force) {}
static inline void lockdep_init_task(struct task_struct *task) {}
static inline void lockdep_free_task(struct task_struct *task) {}
#ifdef CONFIG_LOCK_STAT

4
include/linux/percpu-rwsem.h
View File

@ -121,7 +121,7 @@ static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem,
lock_release(&sem->rw_sem.dep_map, 1, ip);
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
if (!read)
sem->rw_sem.owner = RWSEM_OWNER_UNKNOWN;
atomic_long_set(&sem->rw_sem.owner, RWSEM_OWNER_UNKNOWN);
#endif
}
@ -131,7 +131,7 @@ static inline void percpu_rwsem_acquire(struct percpu_rw_semaphore *sem,
lock_acquire(&sem->rw_sem.dep_map, 0, 1, read, 1, NULL, ip);
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
if (!read)
sem->rw_sem.owner = current;
atomic_long_set(&sem->rw_sem.owner, (long)current);
#endif
}

16
include/linux/rwsem.h
View File

@ -34,12 +34,13 @@
*/
struct rw_semaphore {
atomic_long_t count;
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
/*
* Write owner. Used as a speculative check to see
* if the owner is running on the cpu.
* Write owner or one of the read owners as well flags regarding
* the current state of the rwsem. Can be used as a speculative
* check to see if the write owner is running on the cpu.
*/
struct task_struct *owner;
atomic_long_t owner;
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
struct optimistic_spin_queue osq; /* spinner MCS lock */
#endif
raw_spinlock_t wait_lock;
@ -50,10 +51,10 @@ struct rw_semaphore {
};
/*
* Setting bit 1 of the owner field but not bit 0 will indicate
* Setting all bits of the owner field except bit 0 will indicate
* that the rwsem is writer-owned with an unknown owner.
*/
#define RWSEM_OWNER_UNKNOWN ((struct task_struct *)-2L)
#define RWSEM_OWNER_UNKNOWN (-2L)
/* In all implementations count != 0 means locked */
static inline int rwsem_is_locked(struct rw_semaphore *sem)
@ -73,13 +74,14 @@ static inline int rwsem_is_locked(struct rw_semaphore *sem)
#endif
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
#define __RWSEM_OPT_INIT(lockname) , .osq = OSQ_LOCK_UNLOCKED, .owner = NULL
#define __RWSEM_OPT_INIT(lockname) , .osq = OSQ_LOCK_UNLOCKED
#else
#define __RWSEM_OPT_INIT(lockname)
#endif
#define __RWSEM_INITIALIZER(name) \
{ __RWSEM_INIT_COUNT(name), \
.owner = ATOMIC_LONG_INIT(0), \
.wait_list = LIST_HEAD_INIT((name).wait_list), \
.wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock) \
__RWSEM_OPT_INIT(name) \

5
include/linux/sched/wake_q.h
View File

@ -51,6 +51,11 @@ static inline void wake_q_init(struct wake_q_head *head)
head->lastp = &head->first;
}
static inline bool wake_q_empty(struct wake_q_head *head)
{
return head->first == WAKE_Q_TAIL;
}
extern void wake_q_add(struct wake_q_head *head, struct task_struct *task);
extern void wake_q_add_safe(struct wake_q_head *head, struct task_struct *task);
extern void wake_up_q(struct wake_q_head *head);

47
include/linux/smp.h
View File

@ -180,29 +180,46 @@ static inline int get_boot_cpu_id(void)
#endif /* !SMP */
/*
* smp_processor_id(): get the current CPU ID.
/**
* raw_processor_id() - get the current (unstable) CPU id
*
* if DEBUG_PREEMPT is enabled then we check whether it is
* used in a preemption-safe way. (smp_processor_id() is safe
* if it's used in a preemption-off critical section, or in
* a thread that is bound to the current CPU.)
*
* NOTE: raw_smp_processor_id() is for internal use only
* (smp_processor_id() is the preferred variant), but in rare
* instances it might also be used to turn off false positives
* (i.e. smp_processor_id() use that the debugging code reports but
* which use for some reason is legal). Don't use this to hack around
* the warning message, as your code might not work under PREEMPT.
* For then you know what you are doing and need an unstable
* CPU id.
*/
/**
* smp_processor_id() - get the current (stable) CPU id
*
* This is the normal accessor to the CPU id and should be used
* whenever possible.
*
* The CPU id is stable when:
*
* - IRQs are disabled;
* - preemption is disabled;
* - the task is CPU affine.
*
* When CONFIG_DEBUG_PREEMPT; we verify these assumption and WARN
* when smp_processor_id() is used when the CPU id is not stable.
*/
/*
* Allow the architecture to differentiate between a stable and unstable read.
* For example, x86 uses an IRQ-safe asm-volatile read for the unstable but a
* regular asm read for the stable.
*/
#ifndef __smp_processor_id
#define __smp_processor_id(x) raw_smp_processor_id(x)
#endif
#ifdef CONFIG_DEBUG_PREEMPT
extern unsigned int debug_smp_processor_id(void);
# define smp_processor_id() debug_smp_processor_id()
#else
# define smp_processor_id() raw_smp_processor_id()
# define smp_processor_id() __smp_processor_id()
#endif
#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
#define get_cpu() ({ preempt_disable(); __smp_processor_id(); })
#define put_cpu() preempt_enable()
/*

2
include/linux/types.h
View File

@ -174,7 +174,7 @@ typedef struct {
#ifdef CONFIG_64BIT
typedef struct {
long counter;
s64 counter;
} atomic64_t;
#endif

2
init/init_task.c
View File

@ -166,6 +166,8 @@ struct task_struct init_task
.softirqs_enabled = 1,
#endif
#ifdef CONFIG_LOCKDEP
.lockdep_depth = 0, /* no locks held yet */
.curr_chain_key = INITIAL_CHAIN_KEY,
.lockdep_recursion = 0,
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER

3
kernel/fork.c
View File

@ -1952,9 +1952,6 @@ static __latent_entropy struct task_struct *copy_process(
p->pagefault_disabled = 0;
#ifdef CONFIG_LOCKDEP
p->lockdep_depth = 0; /* no locks held yet */
p->curr_chain_key = 0;
p->lockdep_recursion = 0;
lockdep_init_task(p);
#endif

69
kernel/futex.c
View File

@ -470,6 +470,37 @@ enum futex_access {
FUTEX_WRITE
};
/**
* futex_setup_timer - set up the sleeping hrtimer.
* @time: ptr to the given timeout value
* @timeout: the hrtimer_sleeper structure to be set up
* @flags: futex flags
* @range_ns: optional range in ns
*
* Return: Initialized hrtimer_sleeper structure or NULL if no timeout
* value given
*/
static inline struct hrtimer_sleeper *
futex_setup_timer(ktime_t *time, struct hrtimer_sleeper *timeout,
int flags, u64 range_ns)
{
if (!time)
return NULL;
hrtimer_init_on_stack(&timeout->timer, (flags & FLAGS_CLOCKRT) ?
CLOCK_REALTIME : CLOCK_MONOTONIC,
HRTIMER_MODE_ABS);
hrtimer_init_sleeper(timeout, current);
/*
* If range_ns is 0, calling hrtimer_set_expires_range_ns() is
* effectively the same as calling hrtimer_set_expires().
*/
hrtimer_set_expires_range_ns(&timeout->timer, *time, range_ns);
return timeout;
}
/**
* get_futex_key() - Get parameters which are the keys for a futex
* @uaddr: virtual address of the futex
@ -2679,7 +2710,7 @@ out:
static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val,
ktime_t *abs_time, u32 bitset)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct hrtimer_sleeper timeout, *to;
struct restart_block *restart;
struct futex_hash_bucket *hb;
struct futex_q q = futex_q_init;
@ -2689,17 +2720,8 @@ static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val,
return -EINVAL;
q.bitset = bitset;
if (abs_time) {
to = &timeout;
hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
CLOCK_REALTIME : CLOCK_MONOTONIC,
HRTIMER_MODE_ABS);
hrtimer_init_sleeper(to, current);
hrtimer_set_expires_range_ns(&to->timer, *abs_time,
current->timer_slack_ns);
}
to = futex_setup_timer(abs_time, &timeout, flags,
current->timer_slack_ns);
retry:
/*
* Prepare to wait on uaddr. On success, holds hb lock and increments
@ -2779,7 +2801,7 @@ static long futex_wait_restart(struct restart_block *restart)
static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
ktime_t *time, int trylock)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct hrtimer_sleeper timeout, *to;
struct futex_pi_state *pi_state = NULL;
struct rt_mutex_waiter rt_waiter;
struct futex_hash_bucket *hb;
@ -2792,13 +2814,7 @@ static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
if (refill_pi_state_cache())
return -ENOMEM;
if (time) {
to = &timeout;
hrtimer_init_on_stack(&to->timer, CLOCK_REALTIME,
HRTIMER_MODE_ABS);
hrtimer_init_sleeper(to, current);
hrtimer_set_expires(&to->timer, *time);
}
to = futex_setup_timer(time, &timeout, FLAGS_CLOCKRT, 0);
retry:
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q.key, FUTEX_WRITE);
@ -3195,7 +3211,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
u32 val, ktime_t *abs_time, u32 bitset,
u32 __user *uaddr2)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct hrtimer_sleeper timeout, *to;
struct futex_pi_state *pi_state = NULL;
struct rt_mutex_waiter rt_waiter;
struct futex_hash_bucket *hb;
@ -3212,15 +3228,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
if (!bitset)
return -EINVAL;
if (abs_time) {
to = &timeout;
hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
CLOCK_REALTIME : CLOCK_MONOTONIC,
HRTIMER_MODE_ABS);
hrtimer_init_sleeper(to, current);
hrtimer_set_expires_range_ns(&to->timer, *abs_time,
current->timer_slack_ns);
}
to = futex_setup_timer(abs_time, &timeout, flags,
current->timer_slack_ns);
/*
* The waiter is allocated on our stack, manipulated by the requeue

66
kernel/jump_label.c
View File

@ -37,12 +37,26 @@ static int jump_label_cmp(const void *a, const void *b)
const struct jump_entry *jea = a;
const struct jump_entry *jeb = b;
/*
* Entrires are sorted by key.
*/
if (jump_entry_key(jea) < jump_entry_key(jeb))
return -1;
if (jump_entry_key(jea) > jump_entry_key(jeb))
return 1;
/*
* In the batching mode, entries should also be sorted by the code
* inside the already sorted list of entries, enabling a bsearch in
* the vector.
*/
if (jump_entry_code(jea) < jump_entry_code(jeb))
return -1;
if (jump_entry_code(jea) > jump_entry_code(jeb))
return 1;
return 0;
}
@ -384,25 +398,55 @@ static enum jump_label_type jump_label_type(struct jump_entry *entry)
return enabled ^ branch;
}
static bool jump_label_can_update(struct jump_entry *entry, bool init)
{
/*
* Cannot update code that was in an init text area.
*/
if (!init && jump_entry_is_init(entry))
return false;
if (!kernel_text_address(jump_entry_code(entry))) {
WARN_ONCE(1, "can't patch jump_label at %pS", (void *)jump_entry_code(entry));
return false;
}
return true;
}
#ifndef HAVE_JUMP_LABEL_BATCH
static void __jump_label_update(struct static_key *key,
struct jump_entry *entry,
struct jump_entry *stop,
bool init)
{
for (; (entry < stop) && (jump_entry_key(entry) == key); entry++) {
/*
* An entry->code of 0 indicates an entry which has been
* disabled because it was in an init text area.
*/
if (init || !jump_entry_is_init(entry)) {
if (kernel_text_address(jump_entry_code(entry)))
arch_jump_label_transform(entry, jump_label_type(entry));
else
WARN_ONCE(1, "can't patch jump_label at %pS",
(void *)jump_entry_code(entry));
}
if (jump_label_can_update(entry, init))
arch_jump_label_transform(entry, jump_label_type(entry));
}
}
#else
static void __jump_label_update(struct static_key *key,
struct jump_entry *entry,
struct jump_entry *stop,
bool init)
{
for (; (entry < stop) && (jump_entry_key(entry) == key); entry++) {
if (!jump_label_can_update(entry, init))
continue;
if (!arch_jump_label_transform_queue(entry, jump_label_type(entry))) {
/*
* Queue is full: Apply the current queue and try again.
*/
arch_jump_label_transform_apply();
BUG_ON(!arch_jump_label_transform_queue(entry, jump_label_type(entry)));
}
}
arch_jump_label_transform_apply();
}
#endif
void __init jump_label_init(void)
{

2
kernel/locking/Makefile
View File

@ -3,7 +3,7 @@
# and is generally not a function of system call inputs.
KCOV_INSTRUMENT := n
obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o rwsem-xadd.o
obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)

45
kernel/locking/lock_events.h
View File

@ -31,50 +31,13 @@ enum lock_events {
DECLARE_PER_CPU(unsigned long, lockevents[lockevent_num]);
/*
* The purpose of the lock event counting subsystem is to provide a low
* overhead way to record the number of specific locking events by using
* percpu counters. It is the percpu sum that matters, not specifically
* how many of them happens in each cpu.
*
* It is possible that the same percpu counter may be modified in both
* the process and interrupt contexts. For architectures that perform
* percpu operation with multiple instructions, it is possible to lose
* count if a process context percpu update is interrupted in the middle
* and the same counter is updated in the interrupt context. Therefore,
* the generated percpu sum may not be precise. The error, if any, should
* be small and insignificant.
*
* For those architectures that do multi-instruction percpu operation,
* preemption in the middle and moving the task to another cpu may cause
* a larger error in the count. Again, this will be few and far between.
* Given the imprecise nature of the count and the possibility of resetting
* the count and doing the measurement again, this is not really a big
* problem.
*
* To get a better picture of what is happening under the hood, it is
* suggested that a few measurements should be taken with the counts
* reset in between to stamp out outliner because of these possible
* error conditions.
*
* To minimize overhead, we use __this_cpu_*() in all cases except when
* CONFIG_DEBUG_PREEMPT is defined. In this particular case, this_cpu_*()
* will be used to avoid the appearance of unwanted BUG messages.
*/
#ifdef CONFIG_DEBUG_PREEMPT
#define lockevent_percpu_inc(x) this_cpu_inc(x)
#define lockevent_percpu_add(x, v) this_cpu_add(x, v)
#else
#define lockevent_percpu_inc(x) __this_cpu_inc(x)
#define lockevent_percpu_add(x, v) __this_cpu_add(x, v)
#endif
/*
* Increment the PV qspinlock statistical counters
* Increment the statistical counters. use raw_cpu_inc() because of lower
* overhead and we don't care if we loose the occasional update.
*/
static inline void __lockevent_inc(enum lock_events event, bool cond)
{
if (cond)
lockevent_percpu_inc(lockevents[event]);
raw_cpu_inc(lockevents[event]);
}
#define lockevent_inc(ev) __lockevent_inc(LOCKEVENT_ ##ev, true)
@ -82,7 +45,7 @@ static inline void __lockevent_inc(enum lock_events event, bool cond)
static inline void __lockevent_add(enum lock_events event, int inc)
{
lockevent_percpu_add(lockevents[event], inc);
raw_cpu_add(lockevents[event], inc);
}
#define lockevent_add(ev, c) __lockevent_add(LOCKEVENT_ ##ev, c)

12
kernel/locking/lock_events_list.h
View File

@ -56,12 +56,16 @@ LOCK_EVENT(rwsem_sleep_reader) /* # of reader sleeps */
LOCK_EVENT(rwsem_sleep_writer) /* # of writer sleeps */
LOCK_EVENT(rwsem_wake_reader) /* # of reader wakeups */
LOCK_EVENT(rwsem_wake_writer) /* # of writer wakeups */
LOCK_EVENT(rwsem_opt_wlock) /* # of write locks opt-spin acquired */
LOCK_EVENT(rwsem_opt_fail) /* # of failed opt-spinnings */
LOCK_EVENT(rwsem_opt_rlock) /* # of opt-acquired read locks */
LOCK_EVENT(rwsem_opt_wlock) /* # of opt-acquired write locks */
LOCK_EVENT(rwsem_opt_fail) /* # of failed optspins */
LOCK_EVENT(rwsem_opt_nospin) /* # of disabled optspins */
LOCK_EVENT(rwsem_opt_norspin) /* # of disabled reader-only optspins */
LOCK_EVENT(rwsem_opt_rlock2) /* # of opt-acquired 2ndary read locks */
LOCK_EVENT(rwsem_rlock) /* # of read locks acquired */
LOCK_EVENT(rwsem_rlock_fast) /* # of fast read locks acquired */
LOCK_EVENT(rwsem_rlock_fail) /* # of failed read lock acquisitions */
LOCK_EVENT(rwsem_rtrylock) /* # of read trylock calls */
LOCK_EVENT(rwsem_rlock_handoff) /* # of read lock handoffs */
LOCK_EVENT(rwsem_wlock) /* # of write locks acquired */
LOCK_EVENT(rwsem_wlock_fail) /* # of failed write lock acquisitions */
LOCK_EVENT(rwsem_wtrylock) /* # of write trylock calls */
LOCK_EVENT(rwsem_wlock_handoff) /* # of write lock handoffs */

744
kernel/locking/lockdep.c
View File

File diff suppressed because it is too large Load Diff

36
kernel/locking/lockdep_internals.h
View File

@ -131,7 +131,6 @@ extern unsigned int nr_hardirq_chains;
extern unsigned int nr_softirq_chains;
extern unsigned int nr_process_chains;
extern unsigned int max_lockdep_depth;
extern unsigned int max_recursion_depth;
extern unsigned int max_bfs_queue_depth;
@ -160,25 +159,22 @@ lockdep_count_backward_deps(struct lock_class *class)
* and we want to avoid too much cache bouncing.
*/
struct lockdep_stats {
int chain_lookup_hits;
int chain_lookup_misses;
int hardirqs_on_events;
int hardirqs_off_events;
int redundant_hardirqs_on;
int redundant_hardirqs_off;
int softirqs_on_events;
int softirqs_off_events;
int redundant_softirqs_on;
int redundant_softirqs_off;
int nr_unused_locks;
int nr_redundant_checks;
int nr_redundant;
int nr_cyclic_checks;
int nr_cyclic_check_recursions;
int nr_find_usage_forwards_checks;
int nr_find_usage_forwards_recursions;
int nr_find_usage_backwards_checks;
int nr_find_usage_backwards_recursions;
unsigned long chain_lookup_hits;
unsigned int chain_lookup_misses;
unsigned long hardirqs_on_events;
unsigned long hardirqs_off_events;
unsigned long redundant_hardirqs_on;
unsigned long redundant_hardirqs_off;
unsigned long softirqs_on_events;
unsigned long softirqs_off_events;
unsigned long redundant_softirqs_on;
unsigned long redundant_softirqs_off;
int nr_unused_locks;
unsigned int nr_redundant_checks;
unsigned int nr_redundant;
unsigned int nr_cyclic_checks;
unsigned int nr_find_usage_forwards_checks;
unsigned int nr_find_usage_backwards_checks;
/*
* Per lock class locking operation stat counts

745
kernel/locking/rwsem-xadd.c
View File

@ -1,745 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/* rwsem.c: R/W semaphores: contention handling functions
*
* Written by David Howells (dhowells@redhat.com).
* Derived from arch/i386/kernel/semaphore.c
*
* Writer lock-stealing by Alex Shi <alex.shi@intel.com>
* and Michel Lespinasse <walken@google.com>
*
* Optimistic spinning by Tim Chen <tim.c.chen@intel.com>
* and Davidlohr Bueso <davidlohr@hp.com>. Based on mutexes.
*/
#include <linux/rwsem.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/sched/signal.h>
#include <linux/sched/rt.h>
#include <linux/sched/wake_q.h>
#include <linux/sched/debug.h>
#include <linux/osq_lock.h>
#include "rwsem.h"
/*
* Guide to the rw_semaphore's count field for common values.
* (32-bit case illustrated, similar for 64-bit)
*
* 0x0000000X (1) X readers active or attempting lock, no writer waiting
* X = #active_readers + #readers attempting to lock
* (X*ACTIVE_BIAS)
*
* 0x00000000 rwsem is unlocked, and no one is waiting for the lock or
* attempting to read lock or write lock.
*
* 0xffff000X (1) X readers active or attempting lock, with waiters for lock
* X = #active readers + # readers attempting lock
* (X*ACTIVE_BIAS + WAITING_BIAS)
* (2) 1 writer attempting lock, no waiters for lock
* X-1 = #active readers + #readers attempting lock
* ((X-1)*ACTIVE_BIAS + ACTIVE_WRITE_BIAS)
* (3) 1 writer active, no waiters for lock
* X-1 = #active readers + #readers attempting lock
* ((X-1)*ACTIVE_BIAS + ACTIVE_WRITE_BIAS)
*
* 0xffff0001 (1) 1 reader active or attempting lock, waiters for lock
* (WAITING_BIAS + ACTIVE_BIAS)
* (2) 1 writer active or attempting lock, no waiters for lock
* (ACTIVE_WRITE_BIAS)
*
* 0xffff0000 (1) There are writers or readers queued but none active
* or in the process of attempting lock.
* (WAITING_BIAS)
* Note: writer can attempt to steal lock for this count by adding
* ACTIVE_WRITE_BIAS in cmpxchg and checking the old count
*
* 0xfffe0001 (1) 1 writer active, or attempting lock. Waiters on queue.
* (ACTIVE_WRITE_BIAS + WAITING_BIAS)
*
* Note: Readers attempt to lock by adding ACTIVE_BIAS in down_read and checking
* the count becomes more than 0 for successful lock acquisition,
* i.e. the case where there are only readers or nobody has lock.
* (1st and 2nd case above).
*
* Writers attempt to lock by adding ACTIVE_WRITE_BIAS in down_write and
* checking the count becomes ACTIVE_WRITE_BIAS for successful lock
* acquisition (i.e. nobody else has lock or attempts lock). If
* unsuccessful, in rwsem_down_write_failed, we'll check to see if there
* are only waiters but none active (5th case above), and attempt to
* steal the lock.
*
*/
/*
* Initialize an rwsem:
*/
void __init_rwsem(struct rw_semaphore *sem, const char *name,
struct lock_class_key *key)
{
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/*
* Make sure we are not reinitializing a held semaphore:
*/
debug_check_no_locks_freed((void *)sem, sizeof(*sem));
lockdep_init_map(&sem->dep_map, name, key, 0);
#endif
atomic_long_set(&sem->count, RWSEM_UNLOCKED_VALUE);
raw_spin_lock_init(&sem->wait_lock);
INIT_LIST_HEAD(&sem->wait_list);
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
sem->owner = NULL;
osq_lock_init(&sem->osq);
#endif
}
EXPORT_SYMBOL(__init_rwsem);
enum rwsem_waiter_type {
RWSEM_WAITING_FOR_WRITE,
RWSEM_WAITING_FOR_READ
};
struct rwsem_waiter {
struct list_head list;
struct task_struct *task;
enum rwsem_waiter_type type;
};
enum rwsem_wake_type {
RWSEM_WAKE_ANY, /* Wake whatever's at head of wait list */
RWSEM_WAKE_READERS, /* Wake readers only */
RWSEM_WAKE_READ_OWNED /* Waker thread holds the read lock */
};
/*
* handle the lock release when processes blocked on it that can now run
* - if we come here from up_xxxx(), then:
* - the 'active part' of count (&0x0000ffff) reached 0 (but may have changed)
* - the 'waiting part' of count (&0xffff0000) is -ve (and will still be so)
* - there must be someone on the queue
* - the wait_lock must be held by the caller
* - tasks are marked for wakeup, the caller must later invoke wake_up_q()
* to actually wakeup the blocked task(s) and drop the reference count,
* preferably when the wait_lock is released
* - woken process blocks are discarded from the list after having task zeroed
* - writers are only marked woken if downgrading is false
*/
static void __rwsem_mark_wake(struct rw_semaphore *sem,
enum rwsem_wake_type wake_type,
struct wake_q_head *wake_q)
{
struct rwsem_waiter *waiter, *tmp;
long oldcount, woken = 0, adjustment = 0;
struct list_head wlist;
/*
* Take a peek at the queue head waiter such that we can determine
* the wakeup(s) to perform.
*/
waiter = list_first_entry(&sem->wait_list, struct rwsem_waiter, list);
if (waiter->type == RWSEM_WAITING_FOR_WRITE) {
if (wake_type == RWSEM_WAKE_ANY) {
/*
* Mark writer at the front of the queue for wakeup.
* Until the task is actually later awoken later by
* the caller, other writers are able to steal it.
* Readers, on the other hand, will block as they
* will notice the queued writer.
*/
wake_q_add(wake_q, waiter->task);
lockevent_inc(rwsem_wake_writer);
}
return;
}
/*
* Writers might steal the lock before we grant it to the next reader.
* We prefer to do the first reader grant before counting readers
* so we can bail out early if a writer stole the lock.
*/
if (wake_type != RWSEM_WAKE_READ_OWNED) {
adjustment = RWSEM_ACTIVE_READ_BIAS;
try_reader_grant:
oldcount = atomic_long_fetch_add(adjustment, &sem->count);
if (unlikely(oldcount < RWSEM_WAITING_BIAS)) {
/*
* If the count is still less than RWSEM_WAITING_BIAS
* after removing the adjustment, it is assumed that
* a writer has stolen the lock. We have to undo our
* reader grant.
*/
if (atomic_long_add_return(-adjustment, &sem->count) <
RWSEM_WAITING_BIAS)
return;
/* Last active locker left. Retry waking readers. */
goto try_reader_grant;
}
/*
* Set it to reader-owned to give spinners an early
* indication that readers now have the lock.
*/
__rwsem_set_reader_owned(sem, waiter->task);
}
/*
* Grant an infinite number of read locks to the readers at the front
* of the queue. We know that woken will be at least 1 as we accounted
* for above. Note we increment the 'active part' of the count by the
* number of readers before waking any processes up.
*
* We have to do wakeup in 2 passes to prevent the possibility that
* the reader count may be decremented before it is incremented. It
* is because the to-be-woken waiter may not have slept yet. So it
* may see waiter->task got cleared, finish its critical section and
* do an unlock before the reader count increment.
*
* 1) Collect the read-waiters in a separate list, count them and
* fully increment the reader count in rwsem.
* 2) For each waiters in the new list, clear waiter->task and
* put them into wake_q to be woken up later.
*/
list_for_each_entry(waiter, &sem->wait_list, list) {
if (waiter->type == RWSEM_WAITING_FOR_WRITE)
break;
woken++;
}
list_cut_before(&wlist, &sem->wait_list, &waiter->list);
adjustment = woken * RWSEM_ACTIVE_READ_BIAS - adjustment;
lockevent_cond_inc(rwsem_wake_reader, woken);
if (list_empty(&sem->wait_list)) {
/* hit end of list above */
adjustment -= RWSEM_WAITING_BIAS;
}
if (adjustment)
atomic_long_add(adjustment, &sem->count);
/* 2nd pass */
list_for_each_entry_safe(waiter, tmp, &wlist, list) {
struct task_struct *tsk;
tsk = waiter->task;
get_task_struct(tsk);
/*
* Ensure calling get_task_struct() before setting the reader
* waiter to nil such that rwsem_down_read_failed() cannot
* race with do_exit() by always holding a reference count
* to the task to wakeup.
*/
smp_store_release(&waiter->task, NULL);
/*
* Ensure issuing the wakeup (either by us or someone else)
* after setting the reader waiter to nil.
*/
wake_q_add_safe(wake_q, tsk);
}
}
/*
* This function must be called with the sem->wait_lock held to prevent
* race conditions between checking the rwsem wait list and setting the
* sem->count accordingly.
*/
static inline bool rwsem_try_write_lock(long count, struct rw_semaphore *sem)
{
/*
* Avoid trying to acquire write lock if count isn't RWSEM_WAITING_BIAS.
*/
if (count != RWSEM_WAITING_BIAS)
return false;
/*
* Acquire the lock by trying to set it to ACTIVE_WRITE_BIAS. If there
* are other tasks on the wait list, we need to add on WAITING_BIAS.
*/
count = list_is_singular(&sem->wait_list) ?
RWSEM_ACTIVE_WRITE_BIAS :
RWSEM_ACTIVE_WRITE_BIAS + RWSEM_WAITING_BIAS;
if (atomic_long_cmpxchg_acquire(&sem->count, RWSEM_WAITING_BIAS, count)
== RWSEM_WAITING_BIAS) {
rwsem_set_owner(sem);
return true;
}
return false;
}
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
/*
* Try to acquire write lock before the writer has been put on wait queue.
*/
static inline bool rwsem_try_write_lock_unqueued(struct rw_semaphore *sem)
{
long count = atomic_long_read(&sem->count);
while (!count || count == RWSEM_WAITING_BIAS) {
if (atomic_long_try_cmpxchg_acquire(&sem->count, &count,
count + RWSEM_ACTIVE_WRITE_BIAS)) {
rwsem_set_owner(sem);
lockevent_inc(rwsem_opt_wlock);
return true;
}
}
return false;
}
static inline bool owner_on_cpu(struct task_struct *owner)
{
/*
* As lock holder preemption issue, we both skip spinning if
* task is not on cpu or its cpu is preempted
*/
return owner->on_cpu && !vcpu_is_preempted(task_cpu(owner));
}
static inline bool rwsem_can_spin_on_owner(struct rw_semaphore *sem)
{
struct task_struct *owner;
bool ret = true;
BUILD_BUG_ON(!rwsem_has_anonymous_owner(RWSEM_OWNER_UNKNOWN));
if (need_resched())
return false;
rcu_read_lock();
owner = READ_ONCE(sem->owner);
if (owner) {
ret = is_rwsem_owner_spinnable(owner) &&
owner_on_cpu(owner);
}
rcu_read_unlock();
return ret;
}
/*
* Return true only if we can still spin on the owner field of the rwsem.
*/
static noinline bool rwsem_spin_on_owner(struct rw_semaphore *sem)
{
struct task_struct *owner = READ_ONCE(sem->owner);
if (!is_rwsem_owner_spinnable(owner))
return false;
rcu_read_lock();
while (owner && (READ_ONCE(sem->owner) == owner)) {
/*
* Ensure we emit the owner->on_cpu, dereference _after_
* checking sem->owner still matches owner, if that fails,
* owner might point to free()d memory, if it still matches,
* the rcu_read_lock() ensures the memory stays valid.
*/
barrier();
/*
* abort spinning when need_resched or owner is not running or
* owner's cpu is preempted.
*/
if (need_resched() || !owner_on_cpu(owner)) {
rcu_read_unlock();
return false;
}
cpu_relax();
}
rcu_read_unlock();
/*
* If there is a new owner or the owner is not set, we continue
* spinning.
*/
return is_rwsem_owner_spinnable(READ_ONCE(sem->owner));
}
static bool rwsem_optimistic_spin(struct rw_semaphore *sem)
{
bool taken = false;
preempt_disable();
/* sem->wait_lock should not be held when doing optimistic spinning */
if (!rwsem_can_spin_on_owner(sem))
goto done;
if (!osq_lock(&sem->osq))
goto done;
/*
* Optimistically spin on the owner field and attempt to acquire the
* lock whenever the owner changes. Spinning will be stopped when:
* 1) the owning writer isn't running; or
* 2) readers own the lock as we can't determine if they are
* actively running or not.
*/
while (rwsem_spin_on_owner(sem)) {
/*
* Try to acquire the lock
*/
if (rwsem_try_write_lock_unqueued(sem)) {
taken = true;
break;
}
/*
* When there's no owner, we might have preempted between the
* owner acquiring the lock and setting the owner field. If
* we're an RT task that will live-lock because we won't let
* the owner complete.
*/
if (!sem->owner && (need_resched() || rt_task(current)))
break;
/*
* The cpu_relax() call is a compiler barrier which forces
* everything in this loop to be re-loaded. We don't need
* memory barriers as we'll eventually observe the right
* values at the cost of a few extra spins.
*/
cpu_relax();
}
osq_unlock(&sem->osq);
done:
preempt_enable();
lockevent_cond_inc(rwsem_opt_fail, !taken);
return taken;
}
/*
* Return true if the rwsem has active spinner
*/
static inline bool rwsem_has_spinner(struct rw_semaphore *sem)
{
return osq_is_locked(&sem->osq);
}
#else
static bool rwsem_optimistic_spin(struct rw_semaphore *sem)
{
return false;
}
static inline bool rwsem_has_spinner(struct rw_semaphore *sem)
{
return false;
}
#endif
/*
* Wait for the read lock to be granted
*/
static inline struct rw_semaphore __sched *
__rwsem_down_read_failed_common(struct rw_semaphore *sem, int state)
{
long count, adjustment = -RWSEM_ACTIVE_READ_BIAS;
struct rwsem_waiter waiter;
DEFINE_WAKE_Q(wake_q);
waiter.task = current;
waiter.type = RWSEM_WAITING_FOR_READ;
raw_spin_lock_irq(&sem->wait_lock);
if (list_empty(&sem->wait_list)) {
/*
* In case the wait queue is empty and the lock isn't owned
* by a writer, this reader can exit the slowpath and return
* immediately as its RWSEM_ACTIVE_READ_BIAS has already
* been set in the count.
*/
if (atomic_long_read(&sem->count) >= 0) {
raw_spin_unlock_irq(&sem->wait_lock);
rwsem_set_reader_owned(sem);
lockevent_inc(rwsem_rlock_fast);
return sem;
}
adjustment += RWSEM_WAITING_BIAS;
}
list_add_tail(&waiter.list, &sem->wait_list);
/* we're now waiting on the lock, but no longer actively locking */
count = atomic_long_add_return(adjustment, &sem->count);
/*
* If there are no active locks, wake the front queued process(es).
*
* If there are no writers and we are first in the queue,
* wake our own waiter to join the existing active readers !
*/
if (count == RWSEM_WAITING_BIAS ||
(count > RWSEM_WAITING_BIAS &&
adjustment != -RWSEM_ACTIVE_READ_BIAS))
__rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
raw_spin_unlock_irq(&sem->wait_lock);
wake_up_q(&wake_q);
/* wait to be given the lock */
while (true) {
set_current_state(state);
if (!waiter.task)
break;
if (signal_pending_state(state, current)) {
raw_spin_lock_irq(&sem->wait_lock);
if (waiter.task)
goto out_nolock;
raw_spin_unlock_irq(&sem->wait_lock);
break;
}
schedule();
lockevent_inc(rwsem_sleep_reader);
}
__set_current_state(TASK_RUNNING);
lockevent_inc(rwsem_rlock);
return sem;
out_nolock:
list_del(&waiter.list);
if (list_empty(&sem->wait_list))
atomic_long_add(-RWSEM_WAITING_BIAS, &sem->count);
raw_spin_unlock_irq(&sem->wait_lock);
__set_current_state(TASK_RUNNING);
lockevent_inc(rwsem_rlock_fail);
return ERR_PTR(-EINTR);
}
__visible struct rw_semaphore * __sched
rwsem_down_read_failed(struct rw_semaphore *sem)
{
return __rwsem_down_read_failed_common(sem, TASK_UNINTERRUPTIBLE);
}
EXPORT_SYMBOL(rwsem_down_read_failed);
__visible struct rw_semaphore * __sched
rwsem_down_read_failed_killable(struct rw_semaphore *sem)
{
return __rwsem_down_read_failed_common(sem, TASK_KILLABLE);
}
EXPORT_SYMBOL(rwsem_down_read_failed_killable);
/*
* Wait until we successfully acquire the write lock
*/
static inline struct rw_semaphore *
__rwsem_down_write_failed_common(struct rw_semaphore *sem, int state)
{
long count;
bool waiting = true; /* any queued threads before us */
struct rwsem_waiter waiter;
struct rw_semaphore *ret = sem;
DEFINE_WAKE_Q(wake_q);
/* undo write bias from down_write operation, stop active locking */
count = atomic_long_sub_return(RWSEM_ACTIVE_WRITE_BIAS, &sem->count);
/* do optimistic spinning and steal lock if possible */
if (rwsem_optimistic_spin(sem))
return sem;
/*
* Optimistic spinning failed, proceed to the slowpath
* and block until we can acquire the sem.
*/
waiter.task = current;
waiter.type = RWSEM_WAITING_FOR_WRITE;
raw_spin_lock_irq(&sem->wait_lock);
/* account for this before adding a new element to the list */
if (list_empty(&sem->wait_list))
waiting = false;
list_add_tail(&waiter.list, &sem->wait_list);
/* we're now waiting on the lock, but no longer actively locking */
if (waiting) {
count = atomic_long_read(&sem->count);
/*
* If there were already threads queued before us and there are
* no active writers, the lock must be read owned; so we try to
* wake any read locks that were queued ahead of us.
*/
if (count > RWSEM_WAITING_BIAS) {
__rwsem_mark_wake(sem, RWSEM_WAKE_READERS, &wake_q);
/*
* The wakeup is normally called _after_ the wait_lock
* is released, but given that we are proactively waking
* readers we can deal with the wake_q overhead as it is
* similar to releasing and taking the wait_lock again
* for attempting rwsem_try_write_lock().
*/
wake_up_q(&wake_q);
/*
* Reinitialize wake_q after use.
*/
wake_q_init(&wake_q);
}
} else
count = atomic_long_add_return(RWSEM_WAITING_BIAS, &sem->count);
/* wait until we successfully acquire the lock */
set_current_state(state);
while (true) {
if (rwsem_try_write_lock(count, sem))
break;
raw_spin_unlock_irq(&sem->wait_lock);
/* Block until there are no active lockers. */
do {
if (signal_pending_state(state, current))
goto out_nolock;
schedule();
lockevent_inc(rwsem_sleep_writer);
set_current_state(state);
} while ((count = atomic_long_read(&sem->count)) & RWSEM_ACTIVE_MASK);
raw_spin_lock_irq(&sem->wait_lock);
}
__set_current_state(TASK_RUNNING);
list_del(&waiter.list);
raw_spin_unlock_irq(&sem->wait_lock);
lockevent_inc(rwsem_wlock);
return ret;
out_nolock:
__set_current_state(TASK_RUNNING);
raw_spin_lock_irq(&sem->wait_lock);
list_del(&waiter.list);
if (list_empty(&sem->wait_list))
atomic_long_add(-RWSEM_WAITING_BIAS, &sem->count);
else
__rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
raw_spin_unlock_irq(&sem->wait_lock);
wake_up_q(&wake_q);
lockevent_inc(rwsem_wlock_fail);
return ERR_PTR(-EINTR);
}
__visible struct rw_semaphore * __sched
rwsem_down_write_failed(struct rw_semaphore *sem)
{
return __rwsem_down_write_failed_common(sem, TASK_UNINTERRUPTIBLE);
}
EXPORT_SYMBOL(rwsem_down_write_failed);
__visible struct rw_semaphore * __sched
rwsem_down_write_failed_killable(struct rw_semaphore *sem)
{
return __rwsem_down_write_failed_common(sem, TASK_KILLABLE);
}
EXPORT_SYMBOL(rwsem_down_write_failed_killable);
/*
* handle waking up a waiter on the semaphore
* - up_read/up_write has decremented the active part of count if we come here
*/
__visible
struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem)
{
unsigned long flags;
DEFINE_WAKE_Q(wake_q);
/*
* __rwsem_down_write_failed_common(sem)
* rwsem_optimistic_spin(sem)
* osq_unlock(sem->osq)
* ...
* atomic_long_add_return(&sem->count)
*
* - VS -
*
* __up_write()
* if (atomic_long_sub_return_release(&sem->count) < 0)
* rwsem_wake(sem)
* osq_is_locked(&sem->osq)
*
* And __up_write() must observe !osq_is_locked() when it observes the
* atomic_long_add_return() in order to not miss a wakeup.
*
* This boils down to:
*
* [S.rel] X = 1 [RmW] r0 = (Y += 0)
* MB RMB
* [RmW] Y += 1 [L] r1 = X
*
* exists (r0=1 /\ r1=0)
*/
smp_rmb();
/*
* If a spinner is present, it is not necessary to do the wakeup.
* Try to do wakeup only if the trylock succeeds to minimize
* spinlock contention which may introduce too much delay in the
* unlock operation.
*
* spinning writer up_write/up_read caller
* --------------- -----------------------
* [S] osq_unlock() [L] osq
* MB RMB
* [RmW] rwsem_try_write_lock() [RmW] spin_trylock(wait_lock)
*
* Here, it is important to make sure that there won't be a missed
* wakeup while the rwsem is free and the only spinning writer goes
* to sleep without taking the rwsem. Even when the spinning writer
* is just going to break out of the waiting loop, it will still do
* a trylock in rwsem_down_write_failed() before sleeping. IOW, if
* rwsem_has_spinner() is true, it will guarantee at least one
* trylock attempt on the rwsem later on.
*/
if (rwsem_has_spinner(sem)) {
/*
* The smp_rmb() here is to make sure that the spinner
* state is consulted before reading the wait_lock.
*/
smp_rmb();
if (!raw_spin_trylock_irqsave(&sem->wait_lock, flags))
return sem;
goto locked;
}
raw_spin_lock_irqsave(&sem->wait_lock, flags);
locked:
if (!list_empty(&sem->wait_list))
__rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
wake_up_q(&wake_q);
return sem;
}
EXPORT_SYMBOL(rwsem_wake);
/*
* downgrade a write lock into a read lock
* - caller incremented waiting part of count and discovered it still negative
* - just wake up any readers at the front of the queue
*/
__visible
struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem)
{
unsigned long flags;
DEFINE_WAKE_Q(wake_q);
raw_spin_lock_irqsave(&sem->wait_lock, flags);
if (!list_empty(&sem->wait_list))
__rwsem_mark_wake(sem, RWSEM_WAKE_READ_OWNED, &wake_q);
raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
wake_up_q(&wake_q);
return sem;
}
EXPORT_SYMBOL(rwsem_downgrade_wake);

1453
kernel/locking/rwsem.c
View File

File diff suppressed because it is too large Load Diff

306
kernel/locking/rwsem.h
View File

@ -1,304 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* The least significant 2 bits of the owner value has the following
* meanings when set.
* - RWSEM_READER_OWNED (bit 0): The rwsem is owned by readers
* - RWSEM_ANONYMOUSLY_OWNED (bit 1): The rwsem is anonymously owned,
* i.e. the owner(s) cannot be readily determined. It can be reader
* owned or the owning writer is indeterminate.
*
* When a writer acquires a rwsem, it puts its task_struct pointer
* into the owner field. It is cleared after an unlock.
*
* When a reader acquires a rwsem, it will also puts its task_struct
* pointer into the owner field with both the RWSEM_READER_OWNED and
* RWSEM_ANONYMOUSLY_OWNED bits set. On unlock, the owner field will
* largely be left untouched. So for a free or reader-owned rwsem,
* the owner value may contain information about the last reader that
* acquires the rwsem. The anonymous bit is set because that particular
* reader may or may not still own the lock.
*
* That information may be helpful in debugging cases where the system
* seems to hang on a reader owned rwsem especially if only one reader
* is involved. Ideally we would like to track all the readers that own
* a rwsem, but the overhead is simply too big.
*/
#include "lock_events.h"
#define RWSEM_READER_OWNED (1UL << 0)
#define RWSEM_ANONYMOUSLY_OWNED (1UL << 1)
#ifndef __INTERNAL_RWSEM_H
#define __INTERNAL_RWSEM_H
#include <linux/rwsem.h>
#ifdef CONFIG_DEBUG_RWSEMS
# define DEBUG_RWSEMS_WARN_ON(c, sem) do { \
if (!debug_locks_silent && \
WARN_ONCE(c, "DEBUG_RWSEMS_WARN_ON(%s): count = 0x%lx, owner = 0x%lx, curr 0x%lx, list %sempty\n",\
#c, atomic_long_read(&(sem)->count), \
(long)((sem)->owner), (long)current, \
list_empty(&(sem)->wait_list) ? "" : "not ")) \
debug_locks_off(); \
} while (0)
#else
# define DEBUG_RWSEMS_WARN_ON(c, sem)
#endif
extern void __down_read(struct rw_semaphore *sem);
extern void __up_read(struct rw_semaphore *sem);
/*
* R/W semaphores originally for PPC using the stuff in lib/rwsem.c.
* Adapted largely from include/asm-i386/rwsem.h
* by Paul Mackerras <paulus@samba.org>.
*/
/*
* the semaphore definition
*/
#ifdef CONFIG_64BIT
# define RWSEM_ACTIVE_MASK 0xffffffffL
#else
# define RWSEM_ACTIVE_MASK 0x0000ffffL
#endif
#define RWSEM_ACTIVE_BIAS 0x00000001L
#define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1)
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
/*
* All writes to owner are protected by WRITE_ONCE() to make sure that
* store tearing can't happen as optimistic spinners may read and use
* the owner value concurrently without lock. Read from owner, however,
* may not need READ_ONCE() as long as the pointer value is only used
* for comparison and isn't being dereferenced.
*/
static inline void rwsem_set_owner(struct rw_semaphore *sem)
{
WRITE_ONCE(sem->owner, current);
}
static inline void rwsem_clear_owner(struct rw_semaphore *sem)
{
WRITE_ONCE(sem->owner, NULL);
}
/*
* The task_struct pointer of the last owning reader will be left in
* the owner field.
*
* Note that the owner value just indicates the task has owned the rwsem
* previously, it may not be the real owner or one of the real owners
* anymore when that field is examined, so take it with a grain of salt.
*/
static inline void __rwsem_set_reader_owned(struct rw_semaphore *sem,
struct task_struct *owner)
{
unsigned long val = (unsigned long)owner | RWSEM_READER_OWNED
| RWSEM_ANONYMOUSLY_OWNED;
WRITE_ONCE(sem->owner, (struct task_struct *)val);
}
static inline void rwsem_set_reader_owned(struct rw_semaphore *sem)
{
__rwsem_set_reader_owned(sem, current);
}
/*
* Return true if the a rwsem waiter can spin on the rwsem's owner
* and steal the lock, i.e. the lock is not anonymously owned.
* N.B. !owner is considered spinnable.
*/
static inline bool is_rwsem_owner_spinnable(struct task_struct *owner)
{
return !((unsigned long)owner & RWSEM_ANONYMOUSLY_OWNED);
}
/*
* Return true if rwsem is owned by an anonymous writer or readers.
*/
static inline bool rwsem_has_anonymous_owner(struct task_struct *owner)
{
return (unsigned long)owner & RWSEM_ANONYMOUSLY_OWNED;
}
#ifdef CONFIG_DEBUG_RWSEMS
/*
* With CONFIG_DEBUG_RWSEMS configured, it will make sure that if there
* is a task pointer in owner of a reader-owned rwsem, it will be the
* real owner or one of the real owners. The only exception is when the
* unlock is done by up_read_non_owner().
*/
#define rwsem_clear_reader_owned rwsem_clear_reader_owned
static inline void rwsem_clear_reader_owned(struct rw_semaphore *sem)
{
unsigned long val = (unsigned long)current | RWSEM_READER_OWNED
| RWSEM_ANONYMOUSLY_OWNED;
if (READ_ONCE(sem->owner) == (struct task_struct *)val)
cmpxchg_relaxed((unsigned long *)&sem->owner, val,
RWSEM_READER_OWNED | RWSEM_ANONYMOUSLY_OWNED);
}
#endif
#else
static inline void rwsem_set_owner(struct rw_semaphore *sem)
{
}
static inline void rwsem_clear_owner(struct rw_semaphore *sem)
{
}
static inline void __rwsem_set_reader_owned(struct rw_semaphore *sem,
struct task_struct *owner)
{
}
static inline void rwsem_set_reader_owned(struct rw_semaphore *sem)
{
}
#endif
#ifndef rwsem_clear_reader_owned
static inline void rwsem_clear_reader_owned(struct rw_semaphore *sem)
{
}
#endif
extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem);
extern struct rw_semaphore *rwsem_down_read_failed_killable(struct rw_semaphore *sem);
extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *sem);
extern struct rw_semaphore *rwsem_down_write_failed_killable(struct rw_semaphore *sem);
extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem);
extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem);
/*
* lock for reading
*/
static inline void __down_read(struct rw_semaphore *sem)
{
if (unlikely(atomic_long_inc_return_acquire(&sem->count) <= 0)) {
rwsem_down_read_failed(sem);
DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner &
RWSEM_READER_OWNED), sem);
} else {
rwsem_set_reader_owned(sem);
}
}
static inline int __down_read_killable(struct rw_semaphore *sem)
{
if (unlikely(atomic_long_inc_return_acquire(&sem->count) <= 0)) {
if (IS_ERR(rwsem_down_read_failed_killable(sem)))
return -EINTR;
DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner &
RWSEM_READER_OWNED), sem);
} else {
rwsem_set_reader_owned(sem);
}
return 0;
}
static inline int __down_read_trylock(struct rw_semaphore *sem)
{
/*
* Optimize for the case when the rwsem is not locked at all.
*/
long tmp = RWSEM_UNLOCKED_VALUE;
lockevent_inc(rwsem_rtrylock);
do {
if (atomic_long_try_cmpxchg_acquire(&sem->count, &tmp,
tmp + RWSEM_ACTIVE_READ_BIAS)) {
rwsem_set_reader_owned(sem);
return 1;
}
} while (tmp >= 0);
return 0;
}
/*
* lock for writing
*/
static inline void __down_write(struct rw_semaphore *sem)
{
long tmp;
tmp = atomic_long_add_return_acquire(RWSEM_ACTIVE_WRITE_BIAS,
&sem->count);
if (unlikely(tmp != RWSEM_ACTIVE_WRITE_BIAS))
rwsem_down_write_failed(sem);
rwsem_set_owner(sem);
}
static inline int __down_write_killable(struct rw_semaphore *sem)
{
long tmp;
tmp = atomic_long_add_return_acquire(RWSEM_ACTIVE_WRITE_BIAS,
&sem->count);
if (unlikely(tmp != RWSEM_ACTIVE_WRITE_BIAS))
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
rwsem_set_owner(sem);
return 0;
}
static inline int __down_write_trylock(struct rw_semaphore *sem)
{
long tmp;
lockevent_inc(rwsem_wtrylock);
tmp = atomic_long_cmpxchg_acquire(&sem->count, RWSEM_UNLOCKED_VALUE,
RWSEM_ACTIVE_WRITE_BIAS);
if (tmp == RWSEM_UNLOCKED_VALUE) {
rwsem_set_owner(sem);
return true;
}
return false;
}
/*
* unlock after reading
*/
static inline void __up_read(struct rw_semaphore *sem)
{
long tmp;
DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner & RWSEM_READER_OWNED),
sem);
rwsem_clear_reader_owned(sem);
tmp = atomic_long_dec_return_release(&sem->count);
if (unlikely(tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0))
rwsem_wake(sem);
}
/*
* unlock after writing
*/
static inline void __up_write(struct rw_semaphore *sem)
{
DEBUG_RWSEMS_WARN_ON(sem->owner != current, sem);
rwsem_clear_owner(sem);
if (unlikely(atomic_long_sub_return_release(RWSEM_ACTIVE_WRITE_BIAS,
&sem->count) < 0))
rwsem_wake(sem);
}
/*
* downgrade write lock to read lock
*/
static inline void __downgrade_write(struct rw_semaphore *sem)
{
long tmp;
/*
* When downgrading from exclusive to shared ownership,
* anything inside the write-locked region cannot leak
* into the read side. In contrast, anything in the
* read-locked region is ok to be re-ordered into the
* write side. As such, rely on RELEASE semantics.
*/
DEBUG_RWSEMS_WARN_ON(sem->owner != current, sem);
tmp = atomic_long_add_return_release(-RWSEM_WAITING_BIAS, &sem->count);
rwsem_set_reader_owned(sem);
if (tmp < 0)
rwsem_downgrade_wake(sem);
}
#endif /* __INTERNAL_RWSEM_H */

5
kernel/sched/fair.c
View File

@ -6189,6 +6189,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
u64 time, cost;
s64 delta;
int cpu, nr = INT_MAX;
int this = smp_processor_id();
this_sd = rcu_dereference(*this_cpu_ptr(&sd_llc));
if (!this_sd)
@ -6212,7 +6213,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
nr = 4;
}
time = local_clock();
time = cpu_clock(this);
for_each_cpu_wrap(cpu, sched_domain_span(sd), target) {
if (!--nr)
@ -6223,7 +6224,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
break;
}
time = local_clock() - time;
time = cpu_clock(this) - time;
cost = this_sd->avg_scan_cost;
delta = (s64)(time - cost) / 8;
this_sd->avg_scan_cost += delta;

8
lib/Kconfig.debug
View File

@ -1095,7 +1095,7 @@ config PROVE_LOCKING
select DEBUG_SPINLOCK
select DEBUG_MUTEXES
select DEBUG_RT_MUTEXES if RT_MUTEXES
select DEBUG_RWSEMS if RWSEM_SPIN_ON_OWNER
select DEBUG_RWSEMS
select DEBUG_WW_MUTEX_SLOWPATH
select DEBUG_LOCK_ALLOC
select TRACE_IRQFLAGS
@ -1199,10 +1199,10 @@ config DEBUG_WW_MUTEX_SLOWPATH
config DEBUG_RWSEMS
bool "RW Semaphore debugging: basic checks"
depends on DEBUG_KERNEL && RWSEM_SPIN_ON_OWNER
depends on DEBUG_KERNEL
help
This debugging feature allows mismatched rw semaphore locks and unlocks
to be detected and reported.
This debugging feature allows mismatched rw semaphore locks
and unlocks to be detected and reported.
config DEBUG_LOCK_ALLOC
bool "Lock debugging: detect incorrect freeing of live locks"

32
lib/atomic64.c
View File

@ -42,11 +42,11 @@ static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
return &atomic64_lock[addr & (NR_LOCKS - 1)].lock;
}
long long atomic64_read(const atomic64_t *v)
s64 atomic64_read(const atomic64_t *v)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
long long val;
s64 val;
raw_spin_lock_irqsave(lock, flags);
val = v->counter;
@ -55,7 +55,7 @@ long long atomic64_read(const atomic64_t *v)
}
EXPORT_SYMBOL(atomic64_read);
void atomic64_set(atomic64_t *v, long long i)
void atomic64_set(atomic64_t *v, s64 i)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
@ -67,7 +67,7 @@ void atomic64_set(atomic64_t *v, long long i)
EXPORT_SYMBOL(atomic64_set);
#define ATOMIC64_OP(op, c_op) \
void atomic64_##op(long long a, atomic64_t *v) \
void atomic64_##op(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
raw_spinlock_t *lock = lock_addr(v); \
@ -79,11 +79,11 @@ void atomic64_##op(long long a, atomic64_t *v) \
EXPORT_SYMBOL(atomic64_##op);
#define ATOMIC64_OP_RETURN(op, c_op) \
long long atomic64_##op##_return(long long a, atomic64_t *v) \
s64 atomic64_##op##_return(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
raw_spinlock_t *lock = lock_addr(v); \
long long val; \
s64 val; \
\
raw_spin_lock_irqsave(lock, flags); \
val = (v->counter c_op a); \
@ -93,11 +93,11 @@ long long atomic64_##op##_return(long long a, atomic64_t *v) \
EXPORT_SYMBOL(atomic64_##op##_return);
#define ATOMIC64_FETCH_OP(op, c_op) \
long long atomic64_fetch_##op(long long a, atomic64_t *v) \
s64 atomic64_fetch_##op(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
raw_spinlock_t *lock = lock_addr(v); \
long long val; \
s64 val; \
\
raw_spin_lock_irqsave(lock, flags); \
val = v->counter; \
@ -130,11 +130,11 @@ ATOMIC64_OPS(xor, ^=)
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
long long atomic64_dec_if_positive(atomic64_t *v)
s64 atomic64_dec_if_positive(atomic64_t *v)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
long long val;
s64 val;
raw_spin_lock_irqsave(lock, flags);
val = v->counter - 1;
@ -145,11 +145,11 @@ long long atomic64_dec_if_positive(atomic64_t *v)
}
EXPORT_SYMBOL(atomic64_dec_if_positive);
long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
long long val;
s64 val;
raw_spin_lock_irqsave(lock, flags);
val = v->counter;
@ -160,11 +160,11 @@ long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
}
EXPORT_SYMBOL(atomic64_cmpxchg);
long long atomic64_xchg(atomic64_t *v, long long new)
s64 atomic64_xchg(atomic64_t *v, s64 new)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
long long val;
s64 val;
raw_spin_lock_irqsave(lock, flags);
val = v->counter;
@ -174,11 +174,11 @@ long long atomic64_xchg(atomic64_t *v, long long new)
}
EXPORT_SYMBOL(atomic64_xchg);
long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u)
s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
long long val;
s64 val;
raw_spin_lock_irqsave(lock, flags);
val = v->counter;

2
scripts/atomic/check-atomics.sh
View File

@ -22,7 +22,7 @@ while read header; do
OLDSUM="$(tail -n 1 ${LINUXDIR}/include/${header})"
OLDSUM="${OLDSUM#// }"
NEWSUM="$(head -n -1 ${LINUXDIR}/include/${header} | sha1sum)"
NEWSUM="$(sed '$d' ${LINUXDIR}/include/${header} | sha1sum)"
NEWSUM="${NEWSUM%% *}"
if [ "${OLDSUM}" != "${NEWSUM}" ]; then

8
security/apparmor/label.c
View File

@ -76,7 +76,7 @@ void __aa_proxy_redirect(struct aa_label *orig, struct aa_label *new)
AA_BUG(!orig);
AA_BUG(!new);
lockdep_assert_held_exclusive(&labels_set(orig)->lock);
lockdep_assert_held_write(&labels_set(orig)->lock);
tmp = rcu_dereference_protected(orig->proxy->label,
&labels_ns(orig)->lock);
@ -566,7 +566,7 @@ static bool __label_remove(struct aa_label *label, struct aa_label *new)
AA_BUG(!ls);
AA_BUG(!label);
lockdep_assert_held_exclusive(&ls->lock);
lockdep_assert_held_write(&ls->lock);
if (new)
__aa_proxy_redirect(label, new);
@ -603,7 +603,7 @@ static bool __label_replace(struct aa_label *old, struct aa_label *new)
AA_BUG(!ls);
AA_BUG(!old);
AA_BUG(!new);
lockdep_assert_held_exclusive(&ls->lock);
lockdep_assert_held_write(&ls->lock);
AA_BUG(new->flags & FLAG_IN_TREE);
if (!label_is_stale(old))
@ -640,7 +640,7 @@ static struct aa_label *__label_insert(struct aa_labelset *ls,
AA_BUG(!ls);
AA_BUG(!label);
AA_BUG(labels_set(label) != ls);
lockdep_assert_held_exclusive(&ls->lock);
lockdep_assert_held_write(&ls->lock);
AA_BUG(label->flags & FLAG_IN_TREE);
/* Figure out where to put new node */