linux-kernel - [for-linus][PATCH 02/11] tracing: Remove extra space at the end of hwlat

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Message-ID: <20230902115118.423134788@goodmis.org>
Date:   Sat, 02 Sep 2023 07:50:37 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mikhail Kobuk <m.kobuk@...ras.ru>,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Daniel Bristot de Oliveira <bristot@...nel.org>
Subject: [for-linus][PATCH 02/11] tracing: Remove extra space at the end of hwlat_detector/mode

From: Mikhail Kobuk <m.kobuk@...ras.ru>

Space is printed after each mode value including the last one:
$ echo \"$(sudo cat /sys/kernel/tracing/hwlat_detector/mode)\"
"none [round-robin] per-cpu "

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Link: https://lore.kernel.org/linux-trace-kernel/20230825103432.7750-1-m.kobuk@ispras.ru

Cc: Masami Hiramatsu <mhiramat@...nel.org>
Fixes: 8fa826b7344d ("trace/hwlat: Implement the mode config option")
Signed-off-by: Mikhail Kobuk <m.kobuk@...ras.ru>
Reviewed-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Acked-by: Daniel Bristot de Oliveira <bristot@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_hwlat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 2f37a6e68aa9..b791524a6536 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -635,7 +635,7 @@ static int s_mode_show(struct seq_file *s, void *v)
 	else
 		seq_printf(s, "%s", thread_mode_str[mode]);
 
-	if (mode != MODE_MAX)
+	if (mode < MODE_MAX - 1) /* if mode is any but last */
 		seq_puts(s, " ");
 
 	return 0;
-- 
2.40.1