diff options
| 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 | |
| parent | i386: do not BUG_ON() when MSR is unknown (diff) | |
| download | linux-dev-ab483570a13be2a34c0502b166df8f8b26802103.tar.xz linux-dev-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>
| -rw-r--r-- | include/asm-x86/processor_64.h | 6 | ||||
| -rw-r--r-- | include/linux/prefetch.h | 9 |
2 files changed, 2 insertions, 13 deletions
diff --git a/include/asm-x86/processor_64.h b/include/asm-x86/processor_64.h index f422becbddd9..398c39160fce 100644 --- a/include/asm-x86/processor_64.h +++ b/include/asm-x86/processor_64.h @@ -390,12 +390,6 @@ static inline void sync_core(void) asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory"); } -#define ARCH_HAS_PREFETCH -static inline void prefetch(void *x) -{ - asm volatile("prefetcht0 (%0)" :: "r" (x)); -} - #define ARCH_HAS_PREFETCHW 1 static inline void prefetchw(void *x) { 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 |