diff options
Diffstat (limited to 'kernel/arch/x86/include/asm/cmpxchg_64.h')
-rw-r--r-- | kernel/arch/x86/include/asm/cmpxchg_64.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/arch/x86/include/asm/cmpxchg_64.h b/kernel/arch/x86/include/asm/cmpxchg_64.h new file mode 100644 index 000000000..1af94697a --- /dev/null +++ b/kernel/arch/x86/include/asm/cmpxchg_64.h @@ -0,0 +1,23 @@ +#ifndef _ASM_X86_CMPXCHG_64_H +#define _ASM_X86_CMPXCHG_64_H + +static inline void set_64bit(volatile u64 *ptr, u64 val) +{ + *ptr = val; +} + +#define cmpxchg64(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg((ptr), (o), (n)); \ +}) + +#define cmpxchg64_local(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg_local((ptr), (o), (n)); \ +}) + +#define system_has_cmpxchg_double() cpu_has_cx16 + +#endif /* _ASM_X86_CMPXCHG_64_H */ |