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tracing/filters: Add comment for match callbacks

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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>
This commit is contained in:
Li Zefan 2010-01-14 10:54:40 +08:00 committed by Steven Rostedt
parent 16da27a8bc
commit d1303dd1d6
1 changed files with 12 additions and 1 deletions
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13
kernel/trace/trace_events_filter.c
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@ -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)