Messages in this thread Patch in this message | | | From | Jeremy Fitzhardinge <> | Subject | [PATCH 7/8] x86: add xadd helper macro | Date | Thu, 23 Jun 2011 18:19:19 -0700 |
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From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> --- arch/x86/include/asm/cmpxchg_32.h | 21 +++++++++++++++++++++ arch/x86/include/asm/cmpxchg_64.h | 26 ++++++++++++++++++++++++++ 2 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/cmpxchg_32.h b/arch/x86/include/asm/cmpxchg_32.h index 284a6e8..30f0318 100644 --- a/arch/x86/include/asm/cmpxchg_32.h +++ b/arch/x86/include/asm/cmpxchg_32.h @@ -280,4 +280,25 @@ static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old, #endif +#define xadd(ptr, inc) \ + do { \ + switch (sizeof(*(ptr))) { \ + case 1: \ + asm volatile (LOCK_PREFIX "xaddb %b0, %1\n" \ + : "+r" (inc), "+m" (*(ptr)) \ + : : "memory", "cc"); \ + break; \ + case 2: \ + asm volatile (LOCK_PREFIX "xaddw %w0, %1\n" \ + : "+r" (inc), "+m" (*(ptr)) \ + : : "memory", "cc"); \ + break; \ + case 4: \ + asm volatile (LOCK_PREFIX "xaddl %0, %1\n" \ + : "+r" (inc), "+m" (*(ptr)) \ + : : "memory", "cc"); \ + break; \ + } \ + } while(0) + #endif /* _ASM_X86_CMPXCHG_32_H */ diff --git a/arch/x86/include/asm/cmpxchg_64.h b/arch/x86/include/asm/cmpxchg_64.h index 423ae58..62da1ff 100644 --- a/arch/x86/include/asm/cmpxchg_64.h +++ b/arch/x86/include/asm/cmpxchg_64.h @@ -151,4 +151,30 @@ extern void __cmpxchg_wrong_size(void); cmpxchg_local((ptr), (o), (n)); \ }) +#define xadd(ptr, inc) \ + do { \ + switch (sizeof(*(ptr))) { \ + case 1: \ + asm volatile (LOCK_PREFIX "xaddb %b0, %1\n" \ + : "+r" (inc), "+m" (*(ptr)) \ + : : "memory", "cc"); \ + break; \ + case 2: \ + asm volatile (LOCK_PREFIX "xaddw %w0, %1\n" \ + : "+r" (inc), "+m" (*(ptr)) \ + : : "memory", "cc"); \ + break; \ + case 4: \ + asm volatile (LOCK_PREFIX "xaddl %0, %1\n" \ + : "+r" (inc), "+m" (*(ptr)) \ + : : "memory", "cc"); \ + break; \ + case 8: \ + asm volatile (LOCK_PREFIX "xaddq %q0, %1\n" \ + : "+r" (inc), "+m" (*(ptr)) \ + : : "memory", "cc"); \ + break; \ + } \ + } while(0) + #endif /* _ASM_X86_CMPXCHG_64_H */ -- 1.7.5.4
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