tracing/filters: Fix MATCH_FRONT_ONLY filter matching
Li Zefan [Thu, 14 Jan 2010 02:53:21 +0000 (10:53 +0800)]
MATCH_FRONT_ONLY actually is a full matching:

  # ./perf record -R -f -a -e lock:lock_acquire \
--filter 'name ~rcu_*' sleep 1
  # ./perf trace
  (no output)

We should pass the length of the pattern string to strncmp().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4B4E8721.5090301@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace_events_filter.c

index 50504cb..11c3973 100644 (file)
@@ -261,7 +261,7 @@ static int regex_match_full(char *str, struct regex *r, int len)
 
 static int regex_match_front(char *str, struct regex *r, int len)
 {
-       if (strncmp(str, r->pattern, len) == 0)
+       if (strncmp(str, r->pattern, r->len) == 0)
                return 1;
        return 0;
 }