[PATCH] x86: correct inline asm constraints in __cmpxchg_double()

[Juergen Gross]

Specifying "=a" for output constraints and "a" for input seems to be
wrong. Instead "0" should be used for the input constraint.

Fixes: cdcd629869fab ("x86: Fix and improve cmpxchg_double{,_local}()")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 arch/x86/include/asm/cmpxchg.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
index a55d79b233d3..b3b4d61a8969 100644
--- a/arch/x86/include/asm/cmpxchg.h
+++ b/arch/x86/include/asm/cmpxchg.h
@@ -245,7 +245,7 @@ extern void __add_wrong_size(void)
 	asm volatile(pfx "cmpxchg%c4b %2; sete %0"			\
 		     : "=a" (__ret), "+d" (__old2),			\
 		       "+m" (*(p1)), "+m" (*(p2))			\
-		     : "i" (2 * sizeof(long)), "a" (__old1),		\
+		     : "i" (2 * sizeof(long)), "0" (__old1),		\
 		       "b" (__new1), "c" (__new2));			\
 	__ret;								\
 })
-- 
2.16.4


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