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-rw-r--r--tools/perf/perf.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 454d5d5..75f941b 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -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>
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