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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 <[email protected]>
Acked-by: Arjan van de Ven <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chase Venters 2006-07-08 11:10:29 -05:00 • committed by Linus Torvalds
commit f6dc8c5b8e
7 changed files with 14 additions and 7 deletions
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3
include/asm-sh/processor.h
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@ -9,6 +9,7 @@
#define __ASM_SH_PROCESSOR_H
#ifdef __KERNEL__
#include <linux/compiler.h>
#include <asm/page.h>
#include <asm/types.h>
#include <asm/cache.h>
@ -263,7 +264,7 @@ extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_ESP(tsk) ((tsk)->thread.sp)
#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
#define cpu_relax() do { } while (0)
#define cpu_relax() barrier()
#endif /* __KERNEL__ */
#endif /* __ASM_SH_PROCESSOR_H */