linux-kernel - [tip:x86/atomic] x86-32: Fix atomic64_add

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Message-ID: <tip-6e6104fe085026e6ef82cc5cc303d6c8ceb7e411@git.kernel.org>
Date:	Mon, 1 Mar 2010 19:58:22 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: Fix atomic64_add_unless return value convention

Commit-ID:  6e6104fe085026e6ef82cc5cc303d6c8ceb7e411
Gitweb:     http://git.kernel.org/tip/6e6104fe085026e6ef82cc5cc303d6c8ceb7e411
Author:     Luca Barbieri <luca@...a-barbieri.com>
AuthorDate: Mon, 1 Mar 2010 19:55:46 +0100
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Mon, 1 Mar 2010 11:38:46 -0800

x86-32: Fix atomic64_add_unless return value convention

atomic64_add_unless must return 1 if it perfomed the add and 0 otherwise.
The implementation did the opposite thing.

Reported-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Luca Barbieri <luca@...a-barbieri.com>
LKML-Reference: <1267469749-11878-3-git-send-email-luca@...a-barbieri.com>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 arch/x86/lib/atomic64_386_32.S |    4 ++--
 arch/x86/lib/atomic64_cx8_32.S |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/lib/atomic64_386_32.S b/arch/x86/lib/atomic64_386_32.S
index 5db07fe..a2f847c 100644
--- a/arch/x86/lib/atomic64_386_32.S
+++ b/arch/x86/lib/atomic64_386_32.S
@@ -133,13 +133,13 @@ BEGIN add_unless %ecx
 1:
 	movl %eax,  ($v)
 	movl %edx, 4($v)
-	xorl %eax, %eax
+	movl $1, %eax
 2:
 RETURN
 3:
 	cmpl %edx, %edi
 	jne 1b
-	movl $1, %eax
+	xorl %eax, %eax
 	jmp 2b
 END_
 
diff --git a/arch/x86/lib/atomic64_cx8_32.S b/arch/x86/lib/atomic64_cx8_32.S
index e49c4eb..d0e37b1 100644
--- a/arch/x86/lib/atomic64_cx8_32.S
+++ b/arch/x86/lib/atomic64_cx8_32.S
@@ -180,7 +180,7 @@ ENTRY(atomic64_add_unless_cx8)
 	cmpxchg8b (%ebp)
 	jne 1b
 
-	xorl %eax, %eax
+	movl $1, %eax
 3:
 	addl $8, %esp
 	CFI_ADJUST_CFA_OFFSET -8
@@ -190,7 +190,7 @@ ENTRY(atomic64_add_unless_cx8)
 4:
 	cmpl %edx, 4(%esp)
 	jne 2b
-	movl $1, %eax
+	xorl %eax, %eax
 	jmp 3b
 	CFI_ENDPROC
 ENDPROC(atomic64_add_unless_cx8)
--
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