X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=include%2Fasm-generic%2Fmutex-dec.h;h=f104af7cf4375f045af902af4315834ae41460c2;hb=187dd317f0169142e4adf6263852f93c3b6f6a3c;hp=ed108be6743fcaaca05c2f312f66bdca825abd9e;hpb=b5eb9513f7c1bee862ada22bf1489f53752686bd;p=mv-sheeva.git

diff --git a/include/asm-generic/mutex-dec.h b/include/asm-generic/mutex-dec.h
index ed108be6743..f104af7cf43 100644
--- a/include/asm-generic/mutex-dec.h
+++ b/include/asm-generic/mutex-dec.h
@@ -22,8 +22,6 @@ __mutex_fastpath_lock(atomic_t *count, void (*fail_fn)(atomic_t *))
 {
 	if (unlikely(atomic_dec_return(count) < 0))
 		fail_fn(count);
-	else
-		smp_mb();
 }
 
 /**
@@ -41,10 +39,7 @@ __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
 {
 	if (unlikely(atomic_dec_return(count) < 0))
 		return fail_fn(count);
-	else {
-		smp_mb();
-		return 0;
-	}
+	return 0;
 }
 
 /**
@@ -63,7 +58,6 @@ __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
 static inline void
 __mutex_fastpath_unlock(atomic_t *count, void (*fail_fn)(atomic_t *))
 {
-	smp_mb();
 	if (unlikely(atomic_inc_return(count) <= 0))
 		fail_fn(count);
 }
@@ -88,25 +82,9 @@ __mutex_fastpath_unlock(atomic_t *count, void (*fail_fn)(atomic_t *))
 static inline int
 __mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
 {
-	/*
-	 * We have two variants here. The cmpxchg based one is the best one
-	 * because it never induce a false contention state.  It is included
-	 * here because architectures using the inc/dec algorithms over the
-	 * xchg ones are much more likely to support cmpxchg natively.
-	 *
-	 * If not we fall back to the spinlock based variant - that is
-	 * just as efficient (and simpler) as a 'destructive' probing of
-	 * the mutex state would be.
-	 */
-#ifdef __HAVE_ARCH_CMPXCHG
-	if (likely(atomic_cmpxchg(count, 1, 0) == 1)) {
-		smp_mb();
+	if (likely(atomic_cmpxchg(count, 1, 0) == 1))
 		return 1;
-	}
 	return 0;
-#else
-	return fail_fn(count);
-#endif
 }
 
 #endif