linux-kernel - [tip:x86/asm] x86: Fix atomic64_xxx

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Date:	Wed, 4 Jan 2012 07:32:28 -0800
From:	tip-bot for Eric Dumazet <eric.dumazet@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	eric.dumazet@...il.com, torvalds@...ux-foundation.org,
	cl@...ux.com, akpm@...ux-foundation.org, JBeulich@...e.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/asm] x86: Fix atomic64_xxx_cx8() functions

Commit-ID:  ceb7b40b65539a771d1bfaf47660ac0ee57e0c4f
Gitweb:     http://git.kernel.org/tip/ceb7b40b65539a771d1bfaf47660ac0ee57e0c4f
Author:     Eric Dumazet <eric.dumazet@...il.com>
AuthorDate: Tue, 3 Jan 2012 17:35:40 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 4 Jan 2012 15:01:56 +0100

x86: Fix atomic64_xxx_cx8() functions

It appears about all functions in arch/x86/lib/atomic64_cx8_32.S
are wrong in case cmpxchg8b must be restarted, because
LOCK_PREFIX macro defines a label "1" clashing with other local
labels :

1:
	some_instructions
	LOCK_PREFIX
	cmpxchg8b (%ebp)
	jne 1b  / jumps to beginning of LOCK_PREFIX !

A possible fix is to use a magic label "672" in LOCK_PREFIX asm
definition, similar to the "671" one we defined in
LOCK_PREFIX_HERE.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Acked-by: Jan Beulich <JBeulich@...e.com>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1325608540.2320.103.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/include/asm/alternative-asm.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/alternative-asm.h b/arch/x86/include/asm/alternative-asm.h
index 091508b..952bd01 100644
--- a/arch/x86/include/asm/alternative-asm.h
+++ b/arch/x86/include/asm/alternative-asm.h
@@ -4,10 +4,10 @@
 
 #ifdef CONFIG_SMP
 	.macro LOCK_PREFIX
-1:	lock
+672:	lock
 	.section .smp_locks,"a"
 	.balign 4
-	.long 1b - .
+	.long 672b - .
 	.previous
 	.endm
 #else
--
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