Commit 751e9983 authored Jan 14, 2010 by Li Zefan Committed by Steven Rostedt Jan 14, 2010

ftrace: Fix MATCH_END_ONLY function filter



For '*foo' pattern, we should allow any string ending with
'foo', but ftrace filter incorrectly disallows strings
like bar_foo_foo:

  # echo '*io' > set_ftrace_filter
  # cat set_ftrace_filter | grep 'req_bio_endio'
  # cat available_filter_functions | grep 'req_bio_endio'
  req_bio_endio

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4B4E870E.6060607@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

parent b82a4045

kernel/trace/ftrace.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -1690,7 +1690,7 @@ ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
		static int ftrace_match(char str, char regex, int len, int type)
		{
		int matched = 0;
		char *ptr;
		int slen;

		switch (type) {
		case MATCH_FULL:
		@@ -1706,8 +1706,8 @@ static int ftrace_match(char str, char regex, int len, int type)
		matched = 1;
		break;
		case MATCH_END_ONLY:
		ptr = strstr(str, regex);
		if (ptr && (ptr[len] == 0))
		slen = strlen(str);
		if (slen >= len && memcmp(str + slen - len, regex, len) == 0)
		matched = 1;
		break;
		}