diff --git a/[refs] b/[refs]
index 44b1322061b3..bf3409374f1f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 229c4eedcedcdadf70411120ba34bc37554a74bd
+refs/heads/master: ea5cc87c63b49c133d15ec2911bb2e49e8124516
diff --git a/trunk/Documentation/perf_counter/util/string.c b/trunk/Documentation/perf_counter/util/string.c
new file mode 100644
index 000000000000..ec33c0c7f4e2
--- /dev/null
+++ b/trunk/Documentation/perf_counter/util/string.c
@@ -0,0 +1,34 @@
+#include "string.h"
+
+static int hex(char ch)
+{
+	if ((ch >= '0') && (ch <= '9'))
+		return ch - '0';
+	if ((ch >= 'a') && (ch <= 'f'))
+		return ch - 'a' + 10;
+	if ((ch >= 'A') && (ch <= 'F'))
+		return ch - 'A' + 10;
+	return -1;
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int hex2u64(const char *ptr, __u64 *long_val)
+{
+	const char *p = ptr;
+	*long_val = 0;
+
+	while (*p) {
+		const int hex_val = hex(*p);
+
+		if (hex_val < 0)
+			break;
+
+		*long_val = (*long_val << 4) | hex_val;
+		p++;
+	}
+
+	return p - ptr;
+}
diff --git a/trunk/Documentation/perf_counter/util/string.h b/trunk/Documentation/perf_counter/util/string.h
new file mode 100644
index 000000000000..72812c1c9a7a
--- /dev/null
+++ b/trunk/Documentation/perf_counter/util/string.h
@@ -0,0 +1,8 @@
+#ifndef _PERF_STRING_H_
+#define _PERF_STRING_H_
+
+#include <linux/types.h>
+
+int hex2u64(const char *ptr, __u64 *val);
+
+#endif