linux-kernel - Re: [PATCH 1/3] tracing: Remove unneeded event_mutex lock in event_trigger_regex

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Message-Id: <20251121174718.fc27769642daee97dc020c6f@kernel.org>
Date: Fri, 21 Nov 2025 17:47:18 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Masami
 Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Tom Zanussi <zanussi@...nel.org>
Subject: Re: [PATCH 1/3] tracing: Remove unneeded event_mutex lock in
 event_trigger_regex_release()

On Thu, 20 Nov 2025 15:56:01 -0500
Steven Rostedt <rostedt@...nel.org> wrote:

> From: Steven Rostedt <rostedt@...dmis.org>
> 
> In event_trigger_regex_release(), the only code is:
> 
> 	mutex_lock(&event_mutex);
> 	if (file->f_mode & FMODE_READ)
> 		seq_release(inode, file);
> 	mutex_unlock(&event_mutex);
> 
> 	return 0;
> 
> There's nothing special about the file->f_mode or the seq_release() that
> requires any locking. Remove the unnecessary locks.
> 

Looks good to me.

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>  kernel/trace/trace_events_trigger.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> index 7795af600466..e5dcfcbb2cd5 100644
> --- a/kernel/trace/trace_events_trigger.c
> +++ b/kernel/trace/trace_events_trigger.c
> @@ -314,13 +314,9 @@ static ssize_t event_trigger_regex_write(struct file *file,
>  
>  static int event_trigger_regex_release(struct inode *inode, struct file *file)
>  {
> -	mutex_lock(&event_mutex);
> -
>  	if (file->f_mode & FMODE_READ)
>  		seq_release(inode, file);
>  
> -	mutex_unlock(&event_mutex);
> -
>  	return 0;
>  }
>  
> -- 
> 2.51.0
> 
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>