power: improve inline asm memory constraints

Use "+m" rather than a combination of "=m" and "m" for improved
clarity and consistency.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 8 deletions

diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index d075725bf444..c6569516ba35 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -220,8 +220,8 @@ __xchg_u32(volatile void *p, unsigned long val)
 "       stwcx.  %3,0,%2 \n\
         bne-    1b"
         ISYNC_ON_SMP
-        : "=&r" (prev), "=m" (*(volatile unsigned int *)p)
-        : "r" (p), "r" (val), "m" (*(volatile unsigned int *)p)
+        : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
+        : "r" (p), "r" (val)
         : "cc", "memory");
 
         return prev;
@@ -240,8 +240,8 @@ __xchg_u64(volatile void *p, unsigned long val)
 "       stdcx.  %3,0,%2 \n\
         bne-    1b"
         ISYNC_ON_SMP
-        : "=&r" (prev), "=m" (*(volatile unsigned long *)p)
-        : "r" (p), "r" (val), "m" (*(volatile unsigned long *)p)
+        : "=&r" (prev), "+m" (*(volatile unsigned long *)p)
+        : "r" (p), "r" (val)
         : "cc", "memory");
 
         return prev;
@@ -299,8 +299,8 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
         ISYNC_ON_SMP
         "\n\
 2:"
-        : "=&r" (prev), "=m" (*p)
-        : "r" (p), "r" (old), "r" (new), "m" (*p)
+        : "=&r" (prev), "+m" (*p)
+        : "r" (p), "r" (old), "r" (new)
         : "cc", "memory");
 
         return prev;
@@ -322,8 +322,8 @@ __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new)
         ISYNC_ON_SMP
         "\n\
 2:"
-        : "=&r" (prev), "=m" (*p)
-        : "r" (p), "r" (old), "r" (new), "m" (*p)
+        : "=&r" (prev), "+m" (*p)
+        : "r" (p), "r" (old), "r" (new)
         : "cc", "memory");
 
         return prev;