diff options
| author | Stephen Rothwell <sfr@canb.auug.org.au> | 2011-07-25 13:59:46 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-07-25 14:53:52 -0400 |
| commit | 5f00bcb38ef9a980a33c6dbdc0044964b05f22dd (patch) | |
| tree | 3175fb9375aecb50bde1be0bf4fa8aa8155131d6 /arch/x86/include/asm/cmpxchg_32.h | |
| parent | 34006cee28f7344f9557a4be3816c7891b1bbab1 (diff) | |
| parent | b6844e8f64920cdee620157252169ba63afb0c89 (diff) | |
Merge branch 'master' into devel and apply fixup from Stephen Rothwell:
vfs/nfs: fixup for nfs_open_context change
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'arch/x86/include/asm/cmpxchg_32.h')
| -rw-r--r-- | arch/x86/include/asm/cmpxchg_32.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/x86/include/asm/cmpxchg_32.h b/arch/x86/include/asm/cmpxchg_32.h index 284a6e8f7ce1..3deb7250624c 100644 --- a/arch/x86/include/asm/cmpxchg_32.h +++ b/arch/x86/include/asm/cmpxchg_32.h @@ -280,4 +280,52 @@ static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old, #endif +#define cmpxchg8b(ptr, o1, o2, n1, n2) \ +({ \ + char __ret; \ + __typeof__(o2) __dummy; \ + __typeof__(*(ptr)) __old1 = (o1); \ + __typeof__(o2) __old2 = (o2); \ + __typeof__(*(ptr)) __new1 = (n1); \ + __typeof__(o2) __new2 = (n2); \ + asm volatile(LOCK_PREFIX "cmpxchg8b %2; setz %1" \ + : "=d"(__dummy), "=a" (__ret), "+m" (*ptr)\ + : "a" (__old1), "d"(__old2), \ + "b" (__new1), "c" (__new2) \ + : "memory"); \ + __ret; }) + + +#define cmpxchg8b_local(ptr, o1, o2, n1, n2) \ +({ \ + char __ret; \ + __typeof__(o2) __dummy; \ + __typeof__(*(ptr)) __old1 = (o1); \ + __typeof__(o2) __old2 = (o2); \ + __typeof__(*(ptr)) __new1 = (n1); \ + __typeof__(o2) __new2 = (n2); \ + asm volatile("cmpxchg8b %2; setz %1" \ + : "=d"(__dummy), "=a"(__ret), "+m" (*ptr)\ + : "a" (__old), "d"(__old2), \ + "b" (__new1), "c" (__new2), \ + : "memory"); \ + __ret; }) + + +#define cmpxchg_double(ptr, o1, o2, n1, n2) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 4); \ + VM_BUG_ON((unsigned long)(ptr) % 8); \ + cmpxchg8b((ptr), (o1), (o2), (n1), (n2)); \ +}) + +#define cmpxchg_double_local(ptr, o1, o2, n1, n2) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 4); \ + VM_BUG_ON((unsigned long)(ptr) % 8); \ + cmpxchg16b_local((ptr), (o1), (o2), (n1), (n2)); \ +}) + +#define system_has_cmpxchg_double() cpu_has_cx8 + #endif /* _ASM_X86_CMPXCHG_32_H */ |