From: Andi Kleen <ak@suse.de>
Date: Wed, 27 Sep 2006 19:38:56 +0000 (+0200)
Subject: [PATCH] i386: Use early clobbers for semaphores now
X-Git-Tag: v2.6.19-rc1~900
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=00463c1633b6d6a2178d2dc794c0a70ac2f9ce6b;p=linux-2.6-omap-h63xx.git

[PATCH] i386: Use early clobbers for semaphores now

The new code does clobber the result early, so make sure to tell
gcc to not put it into the same register as a input argument

Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@osdl.org>
Acked-by: Kyle McMartin <kyle@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/asm-i386/semaphore.h b/include/asm-i386/semaphore.h
index e63b6a68f04..4e34a468c38 100644
--- a/include/asm-i386/semaphore.h
+++ b/include/asm-i386/semaphore.h
@@ -126,7 +126,7 @@ static inline int down_interruptible(struct semaphore * sem)
 		"lea %1,%%eax\n\t"
 		"call __down_failed_interruptible\n"
 		"2:"
-		:"=a" (result), "+m" (sem->count)
+		:"=&a" (result), "+m" (sem->count)
 		:
 		:"memory");
 	return result;
@@ -148,7 +148,7 @@ static inline int down_trylock(struct semaphore * sem)
 		"lea %1,%%eax\n\t"
 		"call __down_failed_trylock\n\t"
 		"2:\n"
-		:"=a" (result), "+m" (sem->count)
+		:"=&a" (result), "+m" (sem->count)
 		:
 		:"memory");
 	return result;