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Commit 32f49eab authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Linus Torvalds
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Add cmpxchg64 and cmpxchg64_local to x86_64 



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

Signed-off-by: default avatarMathieu 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f9c4650b

include/asm-x86/cmpxchg_64.h

+16 −6
Original line number Diff line number Diff line
@@ -127,8 +127,18 @@ static inline unsigned long __cmpxchg_local(volatile void *ptr, 
#define cmpxchg(ptr, o, n)						\

	((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o),	\

					(unsigned long)(n), sizeof(*(ptr))))

#define cmpxchg64(ptr, o, n)						\

  ({									\

	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