diff options
| author | H. Peter Anvin <hpa@linux.intel.com> | 2010-07-28 17:05:11 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-07-28 17:05:11 -0700 |
| commit | a378d9338e8dde78314b3a6ae003de351936c729 (patch) | |
| tree | 1f0c947c4c55bbb98c129a260ac604f6b39526ac /arch/x86/lib/cmpxchg.c | |
| parent | 90c8f92f5c807807ca74d5f2f313794925174e6b (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/lib/cmpxchg.c')
| -rw-r--r-- | arch/x86/lib/cmpxchg.c | 18 |
1 files changed, 0 insertions, 18 deletions
diff --git a/arch/x86/lib/cmpxchg.c b/arch/x86/lib/cmpxchg.c index 2056ccf572c..5d619f6df3e 100644 --- a/arch/x86/lib/cmpxchg.c +++ b/arch/x86/lib/cmpxchg.c @@ -52,21 +52,3 @@ unsigned long cmpxchg_386_u32(volatile void *ptr, u32 old, u32 new) } EXPORT_SYMBOL(cmpxchg_386_u32); #endif - -#ifndef CONFIG_X86_CMPXCHG64 -unsigned long long cmpxchg_486_u64(volatile void *ptr, u64 old, u64 new) -{ - u64 prev; - unsigned long flags; - - /* Poor man's cmpxchg8b for 386 and 486. Unsuitable for SMP */ - local_irq_save(flags); - prev = *(u64 *)ptr; - if (prev == old) - *(u64 *)ptr = new; - local_irq_restore(flags); - return prev; -} -EXPORT_SYMBOL(cmpxchg_486_u64); -#endif - |