tracing/filters: Unify the regex parsing helpers

The filter code has stolen the regex parsing function from ftrace to
get the regex support.
We have duplicated this code, so factorize it in the filter area and
make it generally available, as the filter code is the most suited to
host this feature.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>

1 files changed, 9 insertions, 11 deletions

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index d3c94c139567..8c194de675b0 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -279,15 +279,14 @@ static int regex_match_end(char *str, struct regex *r, int len)
 	return 0;
 }
 
-enum regex_type {
-	MATCH_FULL,
-	MATCH_FRONT_ONLY,
-	MATCH_MIDDLE_ONLY,
-	MATCH_END_ONLY,
-};
-
-/*
- * Pass in a buffer containing a regex and this function will
+/**
+ * filter_parse_regex - parse a basic regex
+ * @buff:   the raw regex
+ * @len:    length of the regex
+ * @search: will point to the beginning of the string to compare
+ * @not:    tell whether the match will have to be inverted
+ *
+ * This passes in a buffer containing a regex and this function will
  * set search to point to the search part of the buffer and
  * return the type of search it is (see enum above).
  * This does modify buff.
@@ -297,8 +296,7 @@ enum regex_type {
  *  not returns 1 if buff started with a '!'
  *     0 otherwise.
  */
-static enum regex_type
-filter_parse_regex(char *buff, int len, char **search, int *not)
+enum regex_type filter_parse_regex(char *buff, int len, char **search, int *not)
 {
 	int type = MATCH_FULL;
 	int i;