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| author |   Chase Venters <chase.venters@clientec.com> | 2006-07-08 11:10:29 -0500 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-12 12:56:45 -0700 |
| commit | f6dc8c5b8e04ce28720155383e971561a23899d5 (patch) | |
| tree | df590e4e096ac332a7d95ef96275bebd57ce70c9 /include/asm-sh64 | |
| parent | [PATCH] lockdep: HPET/RTC fix (diff) | |
| download | linux-dev-f6dc8c5b8e04ce28720155383e971561a23899d5.tar.xz linux-dev-f6dc8c5b8e04ce28720155383e971561a23899d5.zip | |
[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>
Diffstat (limited to 'include/asm-sh64')
| -rw-r--r-- | include/asm-sh64/processor.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/asm-sh64/processor.h b/include/asm-sh64/processor.h index 1bf252dad824..eb2bee4b47b9 100644 --- a/include/asm-sh64/processor.h +++ b/include/asm-sh64/processor.h @@ -22,6 +22,7 @@ #include <asm/cache.h> #include <asm/registers.h> #include <linux/threads.h> +#include <linux/compiler.h> /* * Default implementation of macro that returns current @@ -279,7 +280,7 @@ extern unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk) ((tsk)->thread.pc) #define KSTK_ESP(tsk) ((tsk)->thread.sp) -#define cpu_relax() do { } while (0) +#define cpu_relax() barrier() #endif /* __ASSEMBLY__ */ #endif /* __ASM_SH64_PROCESSOR_H */ |