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| author | Luca Barbieri <luca@luca-barbieri.com> | 2010-02-24 10:54:23 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-25 20:47:03 -0800 |
| commit | 9c76b38476b18c45f97098a10b0176b321eba3ea (patch) | |
| tree | a17aff7507a2e2885124210be125b37be552cd39 | |
| parent | b3ac891b67bd4b1fc728d1c784cad1212dea433d (diff) | |
| download | op-kernel-dev-9c76b38476b18c45f97098a10b0176b321eba3ea.zip op-kernel-dev-9c76b38476b18c45f97098a10b0176b321eba3ea.tar.gz | |
x86-32: Allow UP/SMP lock replacement in cmpxchg64
Use the functionality just introduced in the previous patch: mark the
lock prefixes in cmpxchg64 alternatives for UP removal.
Changes in v2:
- Naming change
Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
LKML-Reference: <1267005265-27958-3-git-send-email-luca@luca-barbieri.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | arch/x86/include/asm/cmpxchg_32.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/include/asm/cmpxchg_32.h b/arch/x86/include/asm/cmpxchg_32.h index ffb9bb6..8859e12 100644 --- a/arch/x86/include/asm/cmpxchg_32.h +++ b/arch/x86/include/asm/cmpxchg_32.h @@ -271,7 +271,8 @@ extern unsigned long long cmpxchg_486_u64(volatile void *, u64, u64); __typeof__(*(ptr)) __ret; \ __typeof__(*(ptr)) __old = (o); \ __typeof__(*(ptr)) __new = (n); \ - alternative_io("call cmpxchg8b_emu", \ + alternative_io(LOCK_PREFIX_HERE \ + "call cmpxchg8b_emu", \ "lock; cmpxchg8b (%%esi)" , \ X86_FEATURE_CX8, \ "=A" (__ret), \ |
