linux-kernel - [tip:x86/atomic] x86: Fix LOCK_PREFIX

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Message-ID: <tip-b701a47ba48b698976fb2fe05fb285b0edc1d26a@git.kernel.org>
Date:	Thu, 29 Apr 2010 23:24:43 GMT
From:	"tip-bot for H. Peter Anvin" <hpa@...or.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: Fix LOCK_PREFIX_HERE for uniprocessor build

Commit-ID:  b701a47ba48b698976fb2fe05fb285b0edc1d26a
Gitweb:     http://git.kernel.org/tip/b701a47ba48b698976fb2fe05fb285b0edc1d26a
Author:     H. Peter Anvin <hpa@...or.com>
AuthorDate: Thu, 29 Apr 2010 16:03:57 -0700
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Thu, 29 Apr 2010 16:08:54 -0700

x86: Fix LOCK_PREFIX_HERE for uniprocessor build

Checkin b3ac891b67bd4b1fc728d1c784cad1212dea433d:
x86: Add support for lock prefix in alternatives

... did not define LOCK_PREFIX_HERE in the case of a uniprocessor
build.  As a result, it would cause any of the usages of this macro to
fail on a uniprocessor build.  Fix this by defining LOCK_PREFIX_HERE
as a null string.

Signed-off-by: H. Peter Anvin <hpa@...or.com>
Cc: Luca Barbieri <luca@...a-barbieri.com>
LKML-Reference: <1267005265-27958-2-git-send-email-luca@...a-barbieri.com>
---
 arch/x86/include/asm/alternative.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
index 55fee12..e29a6c9 100644
--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -38,6 +38,7 @@
 #define LOCK_PREFIX LOCK_PREFIX_HERE "\n\tlock; "
 
 #else /* ! CONFIG_SMP */
+#define LOCK_PREFIX_HERE ""
 #define LOCK_PREFIX ""
 #endif
 
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