From 9a7744f9823b9ddf14c47c475e81c1326b1a2787 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Thu, 7 Feb 2008 00:16:26 -0800 Subject: Add cmpxchg_local to xtensa Use the architecture specific __cmpxchg_u32 for 32 bits cmpxchg)_local. Else, use the new generic cmpxchg_local (disables interrupt). Signed-off-by: Mathieu Desnoyers Cc: Chris Zankel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-xtensa/system.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'include') diff --git a/include/asm-xtensa/system.h b/include/asm-xtensa/system.h index ddc970847ae9..e0cb9116d8ab 100644 --- a/include/asm-xtensa/system.h +++ b/include/asm-xtensa/system.h @@ -156,8 +156,30 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) (unsigned long)_n_, sizeof (*(ptr))); \ }) +#include +static inline unsigned long __cmpxchg_local(volatile void *ptr, + unsigned long old, + unsigned long new, int size) +{ + switch (size) { + case 4: + return __cmpxchg_u32(ptr, old, new); + default: + return __cmpxchg_local_generic(ptr, old, new, size); + } + return old; +} + +/* + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make + * them available. + */ +#define cmpxchg_local(ptr, o, n) \ + ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\ + (unsigned long)(n), sizeof(*(ptr)))) +#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) /* * xchg_u32 -- cgit v1.2.3