diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 8f63dba..42ad667 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -10,6 +10,7 @@
 #include <string.h>
 #include <errno.h>
 #include <limits.h>
+#include <byteswap.h>
 #include <linux/kernel.h>
 
 /*
@@ -515,3 +516,24 @@
 
 	return value;
 }
+
+void mem_bswap_32(void *src, int byte_size)
+{
+	u32 *m = src;
+	while (byte_size > 0) {
+		*m = bswap_32(*m);
+		byte_size -= sizeof(u32);
+		++m;
+	}
+}
+
+void mem_bswap_64(void *src, int byte_size)
+{
+	u64 *m = src;
+
+	while (byte_size > 0) {
+		*m = bswap_64(*m);
+		byte_size -= sizeof(u64);
+		++m;
+	}
+}