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| author | Andi Kleen <ak@suse.de> | 2007-10-19 20:35:04 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-19 20:35:04 +0200 |
| commit | ab483570a13be2a34c0502b166df8f8b26802103 (patch) | |
| tree | 6f9997b9313227b25faf28d67fe6e06d001022cc /include/linux/prefetch.h | |
| parent | 124d395fd05efb65d00ca23c7bcc86c272bd8813 (diff) | |
| download | linux-stable-ab483570a13be2a34c0502b166df8f8b26802103.tar.gz linux-stable-ab483570a13be2a34c0502b166df8f8b26802103.tar.bz2 linux-stable-ab483570a13be2a34c0502b166df8f8b26802103.zip | |
x86 & generic: change to __builtin_prefetch()
gcc 3.2+ supports __builtin_prefetch, so it's possible to use it on all
architectures. Change the generic fallback in linux/prefetch.h to use it
instead of noping it out. gcc should do the right thing when the
architecture doesn't support prefetching
Undefine the x86-64 inline assembler version and use the fallback.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/prefetch.h')
| -rw-r--r-- | include/linux/prefetch.h | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/include/linux/prefetch.h b/include/linux/prefetch.h index 1adfe668d031..af7c36a5a521 100644 --- a/include/linux/prefetch.h +++ b/include/linux/prefetch.h @@ -34,17 +34,12 @@ */ -/* - * These cannot be do{}while(0) macros. See the mental gymnastics in - * the loop macro. - */ - #ifndef ARCH_HAS_PREFETCH -static inline void prefetch(const void *x) {;} +#define prefetch(x) __builtin_prefetch(x) #endif #ifndef ARCH_HAS_PREFETCHW -static inline void prefetchw(const void *x) {;} +#define prefetchw(x) __builtin_prefetch(x,1) #endif #ifndef ARCH_HAS_SPINLOCK_PREFETCH |