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, 0 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8d0db6018fe4..db6b83edd49b 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -709,6 +709,13 @@ typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
 
 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 
+enum regex_type {
+        MATCH_FULL,
+        MATCH_FRONT_ONLY,
+        MATCH_MIDDLE_ONLY,
+        MATCH_END_ONLY,
+};
+
 struct regex {
         char                    pattern[MAX_FILTER_STR_VAL];
         int                     len;
@@ -727,6 +734,8 @@ struct filter_pred {
         int                     pop_n;
 };
 
+extern enum regex_type
+filter_parse_regex(char *buff, int len, char **search, int *not);
 extern void print_event_filter(struct ftrace_event_call *call,
                                struct trace_seq *s);
 extern int apply_event_filter(struct ftrace_event_call *call,