Commit 9c76b384 authored Feb 24, 2010 by Luca Barbieri Committed by H. Peter Anvin Feb 25, 2010

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>

parent b3ac891b

arch/x86/include/asm/cmpxchg_32.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -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), \