linux-kernel - [for-next][PATCH 16/21] tracing: Change `if (strlen(glob))` to `if (glob[0])`

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Date:   Wed, 27 Apr 2022 15:36:39 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        Ammar Faizi <ammarfaizi2@...weeb.org>
Subject: [for-next][PATCH 16/21] tracing: Change `if (strlen(glob))` to `if (glob[0])`

From: Ammar Faizi <ammarfaizi2@...weeb.org>

No need to traverse to the end of string. If the first byte is not a NUL
char, it's guaranteed `if (strlen(glob))` is true.

Link: https://lkml.kernel.org/r/20220417185630.199062-3-ammarfaizi2@gnuweeb.org

Cc: Ingo Molnar <mingo@...hat.com>
Cc: GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>
Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_events_hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 80c25be23c45..fe10179893c1 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -6217,7 +6217,7 @@ static int event_hist_trigger_parse(struct event_command *cmd_ops,
 	if (WARN_ON(!glob))
 		return -EINVAL;
 
-	if (strlen(glob)) {
+	if (glob[0]) {
 		hist_err_clear();
 		last_cmd_set(file, param_and_filter);
 	}
-- 
2.35.1