parisc: fix missing cmpxchg file error from system.h split
Commit b4816afa39
("Move the asm-generic/system.h xchg()
implementation to asm-generic/cmpxchg.h") introduced the concept of
asm/cmpxchg.h but the parisc arch never got one. Fork the cmpxchg
content out of the asm/atomic.h file to create one.
Some minor whitespace fixups were done on the block of code that created
the new file.
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
1512cdc357
commit
9e5228ce0b
|
@ -6,6 +6,7 @@
|
|||
#define _ASM_PARISC_ATOMIC_H_
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <asm/cmpxchg.h>
|
||||
|
||||
/*
|
||||
* Atomic operations that C can't guarantee us. Useful for
|
||||
|
@ -48,112 +49,6 @@ extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;
|
|||
# define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
|
||||
#endif
|
||||
|
||||
/* This should get optimized out since it's never called.
|
||||
** Or get a link error if xchg is used "wrong".
|
||||
*/
|
||||
extern void __xchg_called_with_bad_pointer(void);
|
||||
|
||||
|
||||
/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
|
||||
extern unsigned long __xchg8(char, char *);
|
||||
extern unsigned long __xchg32(int, int *);
|
||||
#ifdef CONFIG_64BIT
|
||||
extern unsigned long __xchg64(unsigned long, unsigned long *);
|
||||
#endif
|
||||
|
||||
/* optimizer better get rid of switch since size is a constant */
|
||||
static __inline__ unsigned long
|
||||
__xchg(unsigned long x, __volatile__ void * ptr, int size)
|
||||
{
|
||||
switch(size) {
|
||||
#ifdef CONFIG_64BIT
|
||||
case 8: return __xchg64(x,(unsigned long *) ptr);
|
||||
#endif
|
||||
case 4: return __xchg32((int) x, (int *) ptr);
|
||||
case 1: return __xchg8((char) x, (char *) ptr);
|
||||
}
|
||||
__xchg_called_with_bad_pointer();
|
||||
return x;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** REVISIT - Abandoned use of LDCW in xchg() for now:
|
||||
** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
|
||||
** o and while we are at it, could CONFIG_64BIT code use LDCD too?
|
||||
**
|
||||
** if (__builtin_constant_p(x) && (x == NULL))
|
||||
** if (((unsigned long)p & 0xf) == 0)
|
||||
** return __ldcw(p);
|
||||
*/
|
||||
#define xchg(ptr,x) \
|
||||
((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
|
||||
|
||||
|
||||
#define __HAVE_ARCH_CMPXCHG 1
|
||||
|
||||
/* bug catcher for when unsupported size is used - won't link */
|
||||
extern void __cmpxchg_called_with_bad_pointer(void);
|
||||
|
||||
/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
|
||||
extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old, unsigned int new_);
|
||||
extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new_);
|
||||
|
||||
/* don't worry...optimizer will get rid of most of this */
|
||||
static __inline__ unsigned long
|
||||
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
|
||||
{
|
||||
switch(size) {
|
||||
#ifdef CONFIG_64BIT
|
||||
case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
|
||||
#endif
|
||||
case 4: return __cmpxchg_u32((unsigned int *)ptr, (unsigned int) old, (unsigned int) new_);
|
||||
}
|
||||
__cmpxchg_called_with_bad_pointer();
|
||||
return old;
|
||||
}
|
||||
|
||||
#define cmpxchg(ptr,o,n) \
|
||||
({ \
|
||||
__typeof__(*(ptr)) _o_ = (o); \
|
||||
__typeof__(*(ptr)) _n_ = (n); \
|
||||
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
|
||||
(unsigned long)_n_, sizeof(*(ptr))); \
|
||||
})
|
||||
|
||||
#include <asm-generic/cmpxchg-local.h>
|
||||
|
||||
static inline unsigned long __cmpxchg_local(volatile void *ptr,
|
||||
unsigned long old,
|
||||
unsigned long new_, int size)
|
||||
{
|
||||
switch (size) {
|
||||
#ifdef CONFIG_64BIT
|
||||
case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
|
||||
#endif
|
||||
case 4: return __cmpxchg_u32(ptr, old, new_);
|
||||
default:
|
||||
return __cmpxchg_local_generic(ptr, old, new_, size);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
|
||||
* them available.
|
||||
*/
|
||||
#define cmpxchg_local(ptr, o, n) \
|
||||
((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
|
||||
(unsigned long)(n), sizeof(*(ptr))))
|
||||
#ifdef CONFIG_64BIT
|
||||
#define cmpxchg64_local(ptr, o, n) \
|
||||
({ \
|
||||
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
|
||||
cmpxchg_local((ptr), (o), (n)); \
|
||||
})
|
||||
#else
|
||||
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Note that we need not lock read accesses - aligned word writes/reads
|
||||
* are atomic, so a reader never sees inconsistent values.
|
||||
|
|
116
arch/parisc/include/asm/cmpxchg.h
Normal file
116
arch/parisc/include/asm/cmpxchg.h
Normal file
|
@ -0,0 +1,116 @@
|
|||
/*
|
||||
* forked from parisc asm/atomic.h which was:
|
||||
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
|
||||
* Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
|
||||
*/
|
||||
|
||||
#ifndef _ASM_PARISC_CMPXCHG_H_
|
||||
#define _ASM_PARISC_CMPXCHG_H_
|
||||
|
||||
/* This should get optimized out since it's never called.
|
||||
** Or get a link error if xchg is used "wrong".
|
||||
*/
|
||||
extern void __xchg_called_with_bad_pointer(void);
|
||||
|
||||
/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
|
||||
extern unsigned long __xchg8(char, char *);
|
||||
extern unsigned long __xchg32(int, int *);
|
||||
#ifdef CONFIG_64BIT
|
||||
extern unsigned long __xchg64(unsigned long, unsigned long *);
|
||||
#endif
|
||||
|
||||
/* optimizer better get rid of switch since size is a constant */
|
||||
static inline unsigned long
|
||||
__xchg(unsigned long x, __volatile__ void *ptr, int size)
|
||||
{
|
||||
switch (size) {
|
||||
#ifdef CONFIG_64BIT
|
||||
case 8: return __xchg64(x, (unsigned long *) ptr);
|
||||
#endif
|
||||
case 4: return __xchg32((int) x, (int *) ptr);
|
||||
case 1: return __xchg8((char) x, (char *) ptr);
|
||||
}
|
||||
__xchg_called_with_bad_pointer();
|
||||
return x;
|
||||
}
|
||||
|
||||
/*
|
||||
** REVISIT - Abandoned use of LDCW in xchg() for now:
|
||||
** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
|
||||
** o and while we are at it, could CONFIG_64BIT code use LDCD too?
|
||||
**
|
||||
** if (__builtin_constant_p(x) && (x == NULL))
|
||||
** if (((unsigned long)p & 0xf) == 0)
|
||||
** return __ldcw(p);
|
||||
*/
|
||||
#define xchg(ptr, x) \
|
||||
((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
|
||||
|
||||
#define __HAVE_ARCH_CMPXCHG 1
|
||||
|
||||
/* bug catcher for when unsupported size is used - won't link */
|
||||
extern void __cmpxchg_called_with_bad_pointer(void);
|
||||
|
||||
/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
|
||||
extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old,
|
||||
unsigned int new_);
|
||||
extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr,
|
||||
unsigned long old, unsigned long new_);
|
||||
|
||||
/* don't worry...optimizer will get rid of most of this */
|
||||
static inline unsigned long
|
||||
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
|
||||
{
|
||||
switch (size) {
|
||||
#ifdef CONFIG_64BIT
|
||||
case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
|
||||
#endif
|
||||
case 4: return __cmpxchg_u32((unsigned int *)ptr,
|
||||
(unsigned int)old, (unsigned int)new_);
|
||||
}
|
||||
__cmpxchg_called_with_bad_pointer();
|
||||
return old;
|
||||
}
|
||||
|
||||
#define cmpxchg(ptr, o, n) \
|
||||
({ \
|
||||
__typeof__(*(ptr)) _o_ = (o); \
|
||||
__typeof__(*(ptr)) _n_ = (n); \
|
||||
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
|
||||
(unsigned long)_n_, sizeof(*(ptr))); \
|
||||
})
|
||||
|
||||
#include <asm-generic/cmpxchg-local.h>
|
||||
|
||||
static inline unsigned long __cmpxchg_local(volatile void *ptr,
|
||||
unsigned long old,
|
||||
unsigned long new_, int size)
|
||||
{
|
||||
switch (size) {
|
||||
#ifdef CONFIG_64BIT
|
||||
case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
|
||||
#endif
|
||||
case 4: return __cmpxchg_u32(ptr, old, new_);
|
||||
default:
|
||||
return __cmpxchg_local_generic(ptr, old, new_, size);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
|
||||
* them available.
|
||||
*/
|
||||
#define cmpxchg_local(ptr, o, n) \
|
||||
((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
|
||||
(unsigned long)(n), sizeof(*(ptr))))
|
||||
#ifdef CONFIG_64BIT
|
||||
#define cmpxchg64_local(ptr, o, n) \
|
||||
({ \
|
||||
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
|
||||
cmpxchg_local((ptr), (o), (n)); \
|
||||
})
|
||||
#else
|
||||
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
|
||||
#endif
|
||||
|
||||
#endif /* _ASM_PARISC_CMPXCHG_H_ */
|
Loading…
Reference in a new issue