linux-kernel - [tip:x86/atomic] x86-32: Allow UP/SMP lock replacement in cmpxchg64

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Message-ID: <tip-9c76b38476b18c45f97098a10b0176b321eba3ea@git.kernel.org>
Date:	Fri, 26 Feb 2010 05:12:52 GMT
From:	tip-bot for Luca Barbieri <luca@...a-barbieri.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	luca@...a-barbieri.com, tglx@...utronix.de
Subject: [tip:x86/atomic] x86-32: Allow UP/SMP lock replacement in cmpxchg64

Commit-ID:  9c76b38476b18c45f97098a10b0176b321eba3ea
Gitweb:     http://git.kernel.org/tip/9c76b38476b18c45f97098a10b0176b321eba3ea
Author:     Luca Barbieri <luca@...a-barbieri.com>
AuthorDate: Wed, 24 Feb 2010 10:54:23 +0100
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Thu, 25 Feb 2010 20:47:03 -0800

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@...a-barbieri.com>
LKML-Reference: <1267005265-27958-3-git-send-email-luca@...a-barbieri.com>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 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),				\
--
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