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Subject[PATCH 1/2] perf tools: allow building for ARM
Add definitions of rmb() and cpu_relax() and include the ARM unistd.h
header. The kernel uses different definitions for rmb() depending on
the arch revision and whether the system is SMP or not. The lowest common
denominator is a compiler memory barrier so use that.

Signed-off-by: Jamie Iles <>
Cc: Russell King <>
Cc: Peter Zijlstra <>
tools/perf/perf.h | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 454d5d5..4b8eac6 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -59,6 +59,12 @@
#define cpu_relax() asm volatile ("hint @pause" ::: "memory")

+#ifdef __arm__
+#include "../../arch/arm/include/asm/unistd.h"
+#define rmb() asm volatile("":::"memory")
+#define cpu_relax() asm volatile("":::"memory")
#include <time.h>
#include <unistd.h>
#include <sys/types.h>

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