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@zytor.com>
Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
LKML-Reference: <1267469749-11878-3-git-send-email-luca@luca-barbieri.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/lib/atomic64_386_32.S b/arch/x86/lib/atomic64_386_32.S
index 5db07fe..a2f847c 100644 (file)
--- 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 (file)
--- 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)