diff --git a/include/asm-frv/system.h b/include/asm-frv/system.h
index 2c57f473474..30a67a9da11 100644
--- a/include/asm-frv/system.h
+++ b/include/asm-frv/system.h
@@ -179,14 +179,23 @@ do {							\
 #define mb()			asm volatile ("membar" : : :"memory")
 #define rmb()			asm volatile ("membar" : : :"memory")
 #define wmb()			asm volatile ("membar" : : :"memory")
-#define set_mb(var, value)	do { var = value; mb(); } while (0)
+#define read_barrier_depends()	barrier()
 
-#define smp_mb()		mb()
-#define smp_rmb()		rmb()
-#define smp_wmb()		wmb()
-
-#define read_barrier_depends()		do {} while(0)
+#ifdef CONFIG_SMP
+#define smp_mb()			mb()
+#define smp_rmb()			rmb()
+#define smp_wmb()			wmb()
 #define smp_read_barrier_depends()	read_barrier_depends()
+#define set_mb(var, value) \
+	do { xchg(&var, (value)); } while (0)
+#else
+#define smp_mb()			barrier()
+#define smp_rmb()			barrier()
+#define smp_wmb()			barrier()
+#define smp_read_barrier_depends()	do {} while(0)
+#define set_mb(var, value) \
+	do { var = (value); barrier(); } while (0)
+#endif
 
 #define HARD_RESET_NOW()			\
 do {						\