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tracing: Have the historgram use the result of str_has_prefix() for len of prefix 

As str_has_prefix() returns the length on match, we can use that for the
updating of the string pointer instead of recalculating the prefix size.

Cc: Tom Zanussi  <zanussi@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2018-12-21 18:40:46 -05:00
parent b6b2735514
commit 036876fa56
1 changed files with 5 additions and 4 deletions
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9
kernel/trace/trace_events_hist.c
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@ -4342,12 +4342,13 @@ static int parse_actions(struct hist_trigger_data *hist_data)
unsigned int i;
int ret = 0;
char *str;
int len;
for (i = 0; i < hist_data->attrs->n_actions; i++) {
str = hist_data->attrs->action_str[i];
if (str_has_prefix(str, "onmatch(")) {
char *action_str = str + sizeof("onmatch(") - 1;
if ((len = str_has_prefix(str, "onmatch("))) {
char *action_str = str + len;
data = onmatch_parse(tr, action_str);
if (IS_ERR(data)) {
@ -4355,8 +4356,8 @@ static int parse_actions(struct hist_trigger_data *hist_data)
break;
}
data->fn = action_trace;
} else if (str_has_prefix(str, "onmax(")) {
char *action_str = str + sizeof("onmax(") - 1;
} else if ((len = str_has_prefix(str, "onmax("))) {
char *action_str = str + len;
data = onmax_parse(action_str);
if (IS_ERR(data)) {