diff --git a/[refs] b/[refs]
index e7da8bfc679b..6965415233bc 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 16da27a8bc7a0d050686d1b2e9efb53fab9ed226
+refs/heads/master: d1303dd1d6b220cab375f24fa91a5640e54e169e
diff --git a/trunk/kernel/trace/trace_events_filter.c b/trunk/kernel/trace/trace_events_filter.c
index 60c2a4efad4a..e42af9aad69f 100644
--- a/trunk/kernel/trace/trace_events_filter.c
+++ b/trunk/kernel/trace/trace_events_filter.c
@@ -252,7 +252,18 @@ static int filter_pred_none(struct filter_pred *pred, void *event,
 	return 0;
 }
 
-/* Basic regex callbacks */
+/*
+ * regex_match_foo - Basic regex callbacks
+ *
+ * @str: the string to be searched
+ * @r:   the regex structure containing the pattern string
+ * @len: the length of the string to be searched (including '\0')
+ *
+ * Note:
+ * - @str might not be NULL-terminated if it's of type DYN_STRING
+ *   or STATIC_STRING
+ */
+
 static int regex_match_full(char *str, struct regex *r, int len)
 {
 	if (strncmp(str, r->pattern, len) == 0)