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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-frv/processor.h
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@ -21,6 +21,7 @@
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/sections.h>
#include <asm/segment.h>
@ -139,7 +140,7 @@ unsigned long get_wchan(struct task_struct *p);
extern struct task_struct *alloc_task_struct(void);
extern void free_task_struct(struct task_struct *p);
#define cpu_relax() do { } while (0)
#define cpu_relax() barrier()
/* data cache prefetch */
#define ARCH_HAS_PREFETCH