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Add cmpxchg64 and cmpxchg64_local to x86_64

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Make sure that at least cmpxchg64_local is available on all architectures to use
for unsigned long long values.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Andi Kleen <ak@muc.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers 2008-02-07 00:16:10 -08:00 committed by Linus Torvalds
parent f9c4650bcf
commit 32f49eab5e
1 changed files with 16 additions and 6 deletions
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22
include/asm-x86/cmpxchg_64.h
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@ -124,11 +124,21 @@ static inline unsigned long __cmpxchg_local(volatile void *ptr,
return old; return old;
} }
#define cmpxchg(ptr,o,n)\ #define cmpxchg(ptr, o, n) \
((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
(unsigned long)(n),sizeof(*(ptr)))) (unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg_local(ptr,o,n)\ #define cmpxchg64(ptr, o, n) \
((__typeof__(*(ptr)))__cmpxchg_local((ptr),(unsigned long)(o),\ ({ \
(unsigned long)(n),sizeof(*(ptr)))) BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
cmpxchg((ptr), (o), (n)); \
})
#define cmpxchg_local(ptr, o, n) \
((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
(unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
cmpxchg_local((ptr), (o), (n)); \
})
#endif #endif