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Commit ab483570 authored by Andi Kleen's avatar Andi Kleen Committed by Thomas Gleixner
Browse files

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: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 124d395f

include/asm-x86/processor_64.h

+0 −6
Original line number Diff line number Diff line
@@ -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) 

{

include/linux/prefetch.h

+2 −7
Original line number Diff line number Diff line
@@ -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