Merge branch 'linus' into x86/tracehook

1 files changed, 33 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/barrier.h b/arch/alpha/include/asm/barrier.h
new file mode 100644
index 00000000000..ac78eba909b
--- /dev/null
+++ b/arch/alpha/include/asm/barrier.h
@@ -0,0 +1,33 @@
+#ifndef __BARRIER_H
+#define __BARRIER_H
+
+#include <asm/compiler.h>
+
+#define mb() \
+__asm__ __volatile__("mb": : :"memory")
+
+#define rmb() \
+__asm__ __volatile__("mb": : :"memory")
+
+#define wmb() \
+__asm__ __volatile__("wmb": : :"memory")
+
+#define read_barrier_depends() \
+__asm__ __volatile__("mb": : :"memory")
+
+#ifdef CONFIG_SMP
+#define smp_mb()	mb()
+#define smp_rmb()	rmb()
+#define smp_wmb()	wmb()
+#define smp_read_barrier_depends()	read_barrier_depends()
+#else
+#define smp_mb()	barrier()
+#define smp_rmb()	barrier()
+#define smp_wmb()	barrier()
+#define smp_read_barrier_depends()	do { } while (0)
+#endif
+
+#define set_mb(var, value) \
+do { var = value; mb(); } while (0)
+
+#endif		/* __BARRIER_H */