From f6dc8c5b8e04ce28720155383e971561a23899d5 Mon Sep 17 00:00:00 2001
From: Chase Venters <chase.venters@clientec.com>
Date: Sat, 8 Jul 2006 11:10:29 -0500
Subject: [PATCH] Make cpu_relax() imply barrier() on all arches

During the recent discussion of taking 'volatile' off of the spinlock, I
noticed that while most arches #define cpu_relax() such that it implies
barrier(), some arches define cpu_relax() to be empty.

This patch changes the definition of cpu_relax() for frv, h8300, m68knommu,
sh, sh64, v850 and xtensa from an empty while(0) to the compiler barrier().

Signed-off-by: Chase Venters <chase.venters@clientec.com>
Acked-by: Arjan van de Ven <arjan@Linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 include/asm-h8300/processor.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'include/asm-h8300')

diff --git a/include/asm-h8300/processor.h b/include/asm-h8300/processor.h
index c7e2f45..99b664a 100644
--- a/include/asm-h8300/processor.h
+++ b/include/asm-h8300/processor.h
@@ -17,6 +17,7 @@
  */
 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
 
+#include <linux/compiler.h>
 #include <asm/segment.h>
 #include <asm/fpu.h>
 #include <asm/ptrace.h>
@@ -129,6 +130,6 @@ unsigned long get_wchan(struct task_struct *p);
 	eip; })
 #define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)
 
-#define cpu_relax()    do { } while (0)
+#define cpu_relax()    barrier()
 
 #endif
-- 
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