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authorLi Zefan <lizf@cn.fujitsu.com>2010-01-14 10:54:40 +0800
committerSteven Rostedt <rostedt@goodmis.org>2010-01-14 22:38:14 -0500
commitd1303dd1d6b220cab375f24fa91a5640e54e169e (patch)
tree6b37f4fe7ef331e18c35919ae2fab0ce9da5e6b9 /kernel/trace
parent16da27a8bc7a0d050686d1b2e9efb53fab9ed226 (diff)
tracing/filters: Add comment for match callbacks
We should be clear on 2 things: - the length parameter of a match callback includes tailing '\0'. - the string to be searched might not be NULL-terminated. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4B4E8770.7000608@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_events_filter.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 60c2a4efad4a..e42af9aad69f 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/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)