linux-kernel - [for-next][PATCH 4/5] tracing: Have the historgram use the result of str_has

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Date:   Sat, 22 Dec 2018 11:20:11 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joe Perches <joe@...ches.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        Tom Zanussi <zanussi@...nel.org>
Subject: [for-next][PATCH 4/5] tracing: Have the historgram use the result of str_has_prefix() for
 len of prefix

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

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@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/trace_events_hist.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 0d878dcd1e4b..449d90cfa151 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -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)) {
-- 
2.19.2