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arm64: Define cmpxchg64 and cmpxchg64_local for outside use

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Drivers use cmpxchg64, cmpxchg64_local to perform 64-bit operation, so
they can cross 32-bit and 64-bit platforms (it is a standard way).

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Chen Gang 2013-04-22 06:08:41 +01:00 committed by Catalin Marinas
parent 12f883989c
commit a84b086b87
1 changed files with 3 additions and 0 deletions
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arch/arm64/include/asm/cmpxchg.h
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@ -170,4 +170,7 @@ static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old,
(unsigned long)(n), \
sizeof(*(ptr))))
#define cmpxchg64(ptr,o,n) cmpxchg((ptr),(o),(n))
#define cmpxchg64_local(ptr,o,n) cmpxchg_local((ptr),(o),(n))
#endif /* __ASM_CMPXCHG_H */