Boqun Feng d61fc96a37 lockdep: Avoid to modify chain keys in validate_chain() ... Chris Wilson reported a problem spotted by check_chain_key(): a chain key got changed in validate_chain() because we modify the ->read in validate_chain() to skip checks for dependency adding, and ->read is taken into calculation for chain key since commit f611e8cf98 ("lockdep: Take read/write status in consideration when generate chainkey"). Fix this by avoiding to modify ->read in validate_chain() based on two facts: a) since we now support recursive read lock detection, there is no need to skip checks for dependency adding for recursive readers, b) since we have a), there is only one case left (nest_lock) where we want to skip checks in validate_chain(), we simply remove the modification for ->read and rely on the return value of check_deadlock() to skip the dependency adding. Reported-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20201102053743.450459-1-boqun.feng@gmail.com		2020-11-10 18:38:38 +01:00
..
lock_events.c
lock_events.h
lock_events_list.h
lockdep.c	lockdep: Avoid to modify chain keys in validate_chain()	2020-11-10 18:38:38 +01:00
lockdep_internals.h	lockdep: Fix usage_traceoverflow	2020-10-09 08:53:08 +02:00
lockdep_proc.c	locking/lockdep: Fix overflow in presentation of average lock-time	2020-07-25 21:47:42 +02:00
lockdep_states.h
locktorture.c	locktorture: Make function torture_percpu_rwsem_init() static	2020-08-24 18:45:32 -07:00
Makefile
mcs_spinlock.h
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
osq_lock.c	locking/osq_lock: Annotate a data race in osq_lock	2020-06-29 12:04:48 -07:00
percpu-rwsem.c	locking/percpu-rwsem: Use this_cpu_{inc,dec}() for read_count	2020-09-16 16:26:56 +02:00
qrwlock.c
qspinlock.c	x86/kvm: Add "nopvspin" parameter to disable PV spinlocks	2020-07-08 16:21:57 -04:00
qspinlock_paravirt.h
qspinlock_stat.h
rtmutex-debug.c	kernel: rename show_stack_loglvl() => show_stack()	2020-06-09 09:39:13 -07:00
rtmutex-debug.h
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
rwsem.h
semaphore.c
spinlock.c
spinlock_debug.c
test-ww_mutex.c