diff options
| author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2008-02-07 00:16:26 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 08:42:33 -0800 |
| commit | 9a7744f9823b9ddf14c47c475e81c1326b1a2787 (patch) | |
| tree | a5969eab412bb34aa0f38c6a12a5fffe5553b2ce /include | |
| parent | b62f13439147210d5ad4bc40acee32b94c59f06d (diff) | |
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 <mathieu.desnoyers@polymtl.ca>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-xtensa/system.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/asm-xtensa/system.h b/include/asm-xtensa/system.h index ddc970847ae..e0cb9116d8a 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 <asm-generic/cmpxchg-local.h> +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 |