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[PATCH] Make cpu_relax() imply barrier() on all arches

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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>
This commit is contained in:
Chase Venters
2006-07-08 11:10:29 -05:00
committed by Linus Torvalds
parent 0f74964627
commit f6dc8c5b8e
7 changed files with 14 additions and 7 deletions
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3
include/asm-xtensa/processor.h
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@@ -20,6 +20,7 @@
#include <xtensa/config/tie.h>
#include <xtensa/config/system.h>
#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/coprocessor.h>
@@ -191,7 +192,7 @@ extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->areg[1])
#define cpu_relax() do { } while (0)
#define cpu_relax() barrier()
/* Special register access. */