[PATCH] Use early clobber in semaphores

New code clobbers the result always early, so tell gcc about it
Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/include/asm-x86_64/semaphore.h b/include/asm-x86_64/semaphore.h
index 107bd90429e86e14e47185895d9ab222be3b0652..1194888536b93736f3d2616c6cb4eddfd2803e56 100644 (file)
--- a/include/asm-x86_64/semaphore.h
+++ b/include/asm-x86_64/semaphore.h
@@ -132,7 +132,7 @@ static inline int down_interruptible(struct semaphore * sem)
                "jns 2f\n\t"
                "call __down_failed_interruptible\n"
                "2:\n"
-               :"=a" (result), "=m" (sem->count)
+               :"=&a" (result), "=m" (sem->count)
                :"D" (sem)
                :"memory");
        return result;
@@ -153,7 +153,7 @@ static inline int down_trylock(struct semaphore * sem)
                "jns 2f\n\t"
                "call __down_failed_trylock\n\t"
                "2:\n"
-               :"=a" (result), "=m" (sem->count)
+               :"=&a" (result), "=m" (sem->count)
                :"D" (sem)
                :"memory","cc");
        return result;