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authorH. Peter Anvin <hpa@linux.intel.com>2010-07-28 17:05:11 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2010-07-28 17:05:11 -0700
commita378d9338e8dde78314b3a6ae003de351936c729 (patch)
tree1f0c947c4c55bbb98c129a260ac604f6b39526ac /arch/x86/include/asm/cmpxchg_32.h
parent90c8f92f5c807807ca74d5f2f313794925174e6b (diff)
x86, asm: Merge cmpxchg_486_u64() and cmpxchg8b_emu()
We have two functions for doing exactly the same thing -- emulating cmpxchg8b on 486 and older hardware -- with different calling conventions, and yet doing the same thing. Drop the C version and use the assembly version, via alternatives, for both the local and non-local versions of cmpxchg8b. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> LKML-Reference: <AANLkTikAmaDPji-TVDarmG1yD=fwbffcsmEU=YEuP+8r@mail.gmail.com>
Diffstat (limited to 'arch/x86/include/asm/cmpxchg_32.h')
-rw-r--r--arch/x86/include/asm/cmpxchg_32.h30
1 files changed, 14 insertions, 16 deletions
diff --git a/arch/x86/include/asm/cmpxchg_32.h b/arch/x86/include/asm/cmpxchg_32.h
index f5bd1fd388ff..284a6e8f7ce1 100644
--- a/arch/x86/include/asm/cmpxchg_32.h
+++ b/arch/x86/include/asm/cmpxchg_32.h
@@ -246,8 +246,6 @@ static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old,
* to simulate the cmpxchg8b on the 80386 and 80486 CPU.
*/
-extern unsigned long long cmpxchg_486_u64(volatile void *, u64, u64);
-
#define cmpxchg64(ptr, o, n) \
({ \
__typeof__(*(ptr)) __ret; \
@@ -265,20 +263,20 @@ extern unsigned long long cmpxchg_486_u64(volatile void *, u64, u64);
__ret; })
-
-#define cmpxchg64_local(ptr, o, n) \
-({ \
- __typeof__(*(ptr)) __ret; \
- if (likely(boot_cpu_data.x86 > 4)) \
- __ret = (__typeof__(*(ptr)))__cmpxchg64_local((ptr), \
- (unsigned long long)(o), \
- (unsigned long long)(n)); \
- else \
- __ret = (__typeof__(*(ptr)))cmpxchg_486_u64((ptr), \
- (unsigned long long)(o), \
- (unsigned long long)(n)); \
- __ret; \
-})
+#define cmpxchg64_local(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) __ret; \
+ __typeof__(*(ptr)) __old = (o); \
+ __typeof__(*(ptr)) __new = (n); \
+ alternative_io("call cmpxchg8b_emu", \
+ "cmpxchg8b (%%esi)" , \
+ X86_FEATURE_CX8, \
+ "=A" (__ret), \
+ "S" ((ptr)), "0" (__old), \
+ "b" ((unsigned int)__new), \
+ "c" ((unsigned int)(__new>>32)) \
+ : "memory"); \
+ __ret; })
#endif