fix missing barriers in powerpc atomic store

diff --git a/arch/powerpc/atomic.h b/arch/powerpc/atomic.h
index c4ad40cd5d5e098b6242aaa362911f5414e8af32..a082c09b49f5443220c55e13610ee7fdab2367df 100644 (file)
--- a/arch/powerpc/atomic.h
+++ b/arch/powerpc/atomic.h
@@ -77,7 +77,11 @@ static inline void a_dec(volatile int *x)
 
 static inline void a_store(volatile int *p, int x)
 {
-       *p=x;
+       __asm__ __volatile__ ("\n"
+               "       sync\n"
+               "       stw %1, %0\n"
+               "       isync\n"
+               : "=m"(*p) : "r"(x) : "memory" );
 }
 
 static inline void a_spin()