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-rw-r--r--tools/lguest/lguest.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c
index 49ed25b5bbb9..a64f5cb0c15b 100644
--- a/tools/lguest/lguest.c
+++ b/tools/lguest/lguest.c
@@ -177,8 +177,8 @@ static struct termios orig_term;
* in precise order.
*/
#define wmb() __asm__ __volatile__("" : : : "memory")
-#define rmb() __asm__ __volatile__("" : : : "memory")
-#define mb() __asm__ __volatile__("" : : : "memory")
+#define rmb() __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory")
+#define mb() __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory")
/* Wrapper for the last available index. Makes it easier to change. */
#define lg_last_avail(vq) ((vq)->last_avail_idx)