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perf tools: Allow building for ARM

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Add definitions of rmb() and cpu_relax() and include the ARM
unistd.h header. The __kuser_memory_barrier helper in the helper
page is used to provide the correct memory barrier depending on
the CPU type.

[ The rmb() will work on v6 and v7, segfault on v5. Dynamic
  detection to add v5 support will be added later. ]

Signed-off-by: Jamie Iles <jamie.iles@picochip.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mikael Pettersson <mikpe@it.uu.se>
LKML-Reference: <1260534009-5394-1-git-send-email-jamie.iles@picochip.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jamie Iles 2009-12-11 12:20:09 +00:00 committed by Ingo Molnar
parent 99ac64c826
commit 58e9f94138
1 changed files with 12 additions and 0 deletions
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12
tools/perf/perf.h
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@ -59,6 +59,18 @@
#define cpu_relax() asm volatile ("hint @pause" ::: "memory")
#endif
#ifdef __arm__
#include "../../arch/arm/include/asm/unistd.h"
/*
* Use the __kuser_memory_barrier helper in the CPU helper page. See
* arch/arm/kernel/entry-armv.S in the kernel source for details.
*/
#define rmb() asm volatile("mov r0, #0xffff0fff; mov lr, pc;" \
"sub pc, r0, #95" ::: "r0", "lr", "cc", \
"memory")
#define cpu_relax() asm volatile("":::"memory")
#endif
#include <time.h>
#include <unistd.h>
#include <sys/types.h>