From 5be680ecefdbd840289134719e532bfba2f57466 Mon Sep 17 00:00:00 2001
From: Yogesh Tillu <yogesh.tillu@linaro.org>
Date: Fri, 20 Mar 2015 12:48:45 +0530
Subject: Added assembly instructions for barrier macros

Reviewed-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Yogesh Tillu <yogesh.tillu@linaro.org>
---
 perf_rc_mmap.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/perf_rc_mmap.c b/perf_rc_mmap.c
index 838c869..2c404dc 100644
--- a/perf_rc_mmap.c
+++ b/perf_rc_mmap.c
@@ -20,7 +20,8 @@
 #include <sys/mman.h>
 #include <errno.h>
 #include <string.h>
-#define barrier() asm volatile("" ::: "memory")
+#define barrier() asm volatile("dmb ish" ::: "memory")
+#define isb() asm volatile("isb" ::: "memory")
 static int fddev = -1;
 __attribute__((constructor)) static void
 init(void)
@@ -42,6 +43,7 @@ static unsigned long rdpmc(unsigned int counter)
 {
 	unsigned long int ret;
 	asm volatile("mrs %0, pmccntr_el0" : "=r" (ret));
+	isb();
 	return ret;
 }
 
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