diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index bd376bc..0e5be94 100644
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -232,7 +232,8 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
  * to devices.
  */
 #define mb() 	asm volatile("mfence":::"memory")
-#define rmb()	asm volatile("lfence":::"memory")
+/* #define rmb()	asm volatile("lfence":::"memory") */
+#define rmb()	do {} while(0)
 
 #ifdef CONFIG_UNORDERED_IO
 #define wmb()	asm volatile("sfence" ::: "memory")