Revision 9c3340ea7f5dabf88ca096a917cb0ab1f208ef2a authored by Shuah Khan on 12 September 2017, 01:11:07 UTC, committed by Shuah Khan on 25 September 2017, 16:08:49 UTC
For make O=dir run_tests to work, test scripts from sub-directories need to be copied over to the object directory. Running tests from the object directory is necessary to avoid making the source tree dirty. Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Reviewed-by: Darren Hart (VMware) <dvhart@infradead.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
1 parent 1a94068
prefetch.h
/*
* Generic cache management functions. Everything is arch-specific,
* but this header exists to make sure the defines/functions can be
* used in a generic way.
*
* 2000-11-13 Arjan van de Ven <arjan@fenrus.demon.nl>
*
*/
#ifndef _LINUX_PREFETCH_H
#define _LINUX_PREFETCH_H
#include <linux/types.h>
#include <asm/processor.h>
#include <asm/cache.h>
/*
prefetch(x) attempts to pre-emptively get the memory pointed to
by address "x" into the CPU L1 cache.
prefetch(x) should not cause any kind of exception, prefetch(0) is
specifically ok.
prefetch() should be defined by the architecture, if not, the
#define below provides a no-op define.
There are 3 prefetch() macros:
prefetch(x) - prefetches the cacheline at "x" for read
prefetchw(x) - prefetches the cacheline at "x" for write
spin_lock_prefetch(x) - prefetches the spinlock *x for taking
there is also PREFETCH_STRIDE which is the architecure-preferred
"lookahead" size for prefetching streamed operations.
*/
#ifndef ARCH_HAS_PREFETCH
#define prefetch(x) __builtin_prefetch(x)
#endif
#ifndef ARCH_HAS_PREFETCHW
#define prefetchw(x) __builtin_prefetch(x,1)
#endif
#ifndef ARCH_HAS_SPINLOCK_PREFETCH
#define spin_lock_prefetch(x) prefetchw(x)
#endif
#ifndef PREFETCH_STRIDE
#define PREFETCH_STRIDE (4*L1_CACHE_BYTES)
#endif
static inline void prefetch_range(void *addr, size_t len)
{
#ifdef ARCH_HAS_PREFETCH
char *cp;
char *end = addr + len;
for (cp = addr; cp < end; cp += PREFETCH_STRIDE)
prefetch(cp);
#endif
}
#endif
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