1 files changed, 12 insertions, 0 deletions

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 454d5d55f32d..75f941bfba9e 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>