[PATCH kvm-unit-test 1/6] Introduce memory barriers.

Jason Wang
2010-08-27T05:49:16Z

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
lib/x86/smp.h | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/lib/x86/smp.h b/lib/x86/smp.h
index c2e7350..df5fdba 100644
--- a/lib/x86/smp.h
+++ b/lib/x86/smp.h
@@ -1,6 +1,10 @@
#ifndef __SMP_H
#define __SMP_H

+#define mb() asm volatile("mfence":::"memory")
+#define rmb() asm volatile("lfence":::"memory")
+#define wmb() asm volatile("sfence" ::: "memory")
+
struct spinlock {
int v;
};