From 80af4eeb726f038eddc32826e4238feba5b1dfb4 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Thu, 7 Feb 2008 00:16:25 -0800 Subject: [PATCH] Add cmpxchg_local to sparc64 Use cmpxchg_u32 and cmpxchg_u64 for cmpxchg_local and cmpxchg64_local. For other type sizes, use the new generic cmpxchg_local (disables interrupt). Change: Since the header depends on local_irqsave/local_irqrestore, it must be included after their declaration. Actually, being below the #include should be enough, and on sparc64 it is included at the beginning of system.h. So it makes sense to move it up for sparc64. Signed-off-by: Mathieu Desnoyers Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-sparc64/system.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h index 99a669c..1faefa6 100644 --- a/include/asm-sparc64/system.h +++ b/include/asm-sparc64/system.h @@ -8,6 +8,7 @@ #ifndef __ASSEMBLY__ #include +#include /* * Sparc (general) CPU types @@ -315,6 +316,34 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) (unsigned long)_n_, sizeof(*(ptr))); \ }) +/* + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make + * them available. + */ + +static inline unsigned long __cmpxchg_local(volatile void *ptr, + unsigned long old, + unsigned long new, int size) +{ + switch (size) { + case 4: + case 8: return __cmpxchg(ptr, old, new, size); + default: + return __cmpxchg_local_generic(ptr, old, new, size); + } + + return old; +} + +#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 /* !(__ASSEMBLY__) */ #define arch_align_stack(x) (x) -- 2.7.4