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ftrace: Clarify code for mod command 

"Not" is too abstract variable name - changed to clear_filter.
Removed ftrace_match_module_records function: comparison with !* or *
not does the general code in filter_parse_regex() as it works without
mod command for
  sh# echo '!*' > /sys/kernel/debug/tracing/set_ftrace_filter

Link: http://lkml.kernel.org/r/1443545176-3215-2-git-send-email-0x7f454c46@gmail.com

Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Dmitry Safonov 2015-09-29 19:46:13 +03:00 committed by Steven Rostedt
parent 5e3949f0ac
commit f0a3b154bd
1 changed files with 10 additions and 27 deletions
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37
kernel/trace/ftrace.c
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@ -3454,13 +3454,13 @@ static int ftrace_match(char *str, char *regex, int len, int type)
}
static int
enter_record(struct ftrace_hash *hash, struct dyn_ftrace *rec, int not)
enter_record(struct ftrace_hash *hash, struct dyn_ftrace *rec, int clear_filter)
{
struct ftrace_func_entry *entry;
int ret = 0;
entry = ftrace_lookup_ip(hash, rec->ip);
if (not) {
if (clear_filter) {
/* Do nothing if it doesn't exist */
if (!entry)
return 0;
@ -3499,8 +3499,7 @@ ftrace_match_record(struct dyn_ftrace *rec, char *mod,
}
static int
match_records(struct ftrace_hash *hash, char *buff,
int len, char *mod, int not)
match_records(struct ftrace_hash *hash, char *buff, int len, char *mod)
{
unsigned search_len = 0;
struct ftrace_page *pg;
@ -3509,9 +3508,10 @@ match_records(struct ftrace_hash *hash, char *buff,
char *search = buff;
int found = 0;
int ret;
int clear_filter;
if (len) {
type = filter_parse_regex(buff, len, &search, &not);
type = filter_parse_regex(buff, len, &search, &clear_filter);
search_len = strlen(search);
}
@ -3522,7 +3522,7 @@ match_records(struct ftrace_hash *hash, char *buff,
do_for_each_ftrace_rec(pg, rec) {
if (ftrace_match_record(rec, mod, search, search_len, type)) {
ret = enter_record(hash, rec, not);
ret = enter_record(hash, rec, clear_filter);
if (ret < 0) {
found = ret;
goto out_unlock;
@ -3539,26 +3539,9 @@ match_records(struct ftrace_hash *hash, char *buff,
static int
ftrace_match_records(struct ftrace_hash *hash, char *buff, int len)
{
return match_records(hash, buff, len, NULL, 0);
return match_records(hash, buff, len, NULL);
}
static int
ftrace_match_module_records(struct ftrace_hash *hash, char *buff, char *mod)
{
int not = 0;
/* blank or '*' mean the same */
if (strcmp(buff, "*") == 0)
buff[0] = 0;
/* handle the case of 'dont filter this module' */
if (strcmp(buff, "!") == 0 || strcmp(buff, "!*") == 0) {
buff[0] = 0;
not = 1;
}
return match_records(hash, buff, strlen(buff), mod, not);
}
/*
* We register the module command as a template to show others how
@ -3567,7 +3550,7 @@ ftrace_match_module_records(struct ftrace_hash *hash, char *buff, char *mod)
static int
ftrace_mod_callback(struct ftrace_hash *hash,
char *func, char *cmd, char *param, int enable)
char *func, char *cmd, char *module, int enable)
{
int ret;
@ -3580,10 +3563,10 @@ ftrace_mod_callback(struct ftrace_hash *hash,
*/
/* we must have a module name */
if (!param || !strlen(param))
if (!module || !strlen(module))
return -EINVAL;
ret = ftrace_match_module_records(hash, func, param);
ret = match_records(hash, func, strlen(func), module);
if (!ret)
return -EINVAL;
if (ret < 0)