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[PATCH] Use early clobber in semaphores

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New code clobbers the result always early, so tell gcc about it
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen
2006-09-30 01:47:55 +02:00
committed by Andi Kleen
parent 34596dc9e5
commit c84ef53059
1 changed files with 2 additions and 2 deletions
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4
include/asm-x86_64/semaphore.h
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@@ -132,7 +132,7 @@ static inline int down_interruptible(struct semaphore * sem)
"jns 2f\n\t" "jns 2f\n\t"
"call __down_failed_interruptible\n" "call __down_failed_interruptible\n"
"2:\n" "2:\n"
:"=a" (result), "=m" (sem->count) :"=&a" (result), "=m" (sem->count)
:"D" (sem) :"D" (sem)
:"memory"); :"memory");
return result; return result;
@@ -153,7 +153,7 @@ static inline int down_trylock(struct semaphore * sem)
"jns 2f\n\t" "jns 2f\n\t"
"call __down_failed_trylock\n\t" "call __down_failed_trylock\n\t"
"2:\n" "2:\n"
:"=a" (result), "=m" (sem->count) :"=&a" (result), "=m" (sem->count)
:"D" (sem) :"D" (sem)
:"memory","cc"); :"memory","cc");
return result; return result;