linux-kernel - Re: [PATCH 3/3] tracing: Use strim() in trigger_process_regex() instead of skip

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Message-Id: <20251122002218.538827c78b948a132ba11ee0@kernel.org>
Date: Sat, 22 Nov 2025 00:22:18 +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 3/3] tracing: Use strim() in trigger_process_regex()
 instead of skip_spaces()

On Thu, 20 Nov 2025 15:56:03 -0500
Steven Rostedt <rostedt@...nel.org> wrote:

> From: Steven Rostedt <rostedt@...dmis.org>
> 
> The function trigger_process_regex() is called by a few functions, where
> only one calls strim() on the buffer passed to it. That leaves the other
> functions not trimming the end of the buffer passed in and making it a
> little inconsistent.
> 
> Remove the strim() from event_trigger_regex_write() and have
> trigger_process_regex() use strim() instead of skip_spaces(). The buff
> variable is not passed in as const, so it can be modified.
> 

Looks good to me.

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

Thanks,

> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>  kernel/trace/trace_events_trigger.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> index 16e3449f3cfe..1dfe69146a81 100644
> --- a/kernel/trace/trace_events_trigger.c
> +++ b/kernel/trace/trace_events_trigger.c
> @@ -309,7 +309,8 @@ int trigger_process_regex(struct trace_event_file *file, char *buff)
>  	char *command, *next;
>  	struct event_command *p;
>  
> -	next = buff = skip_spaces(buff);
> +	next = buff = strim(buff);
> +
>  	command = strsep(&next, ": \t");
>  	if (next) {
>  		next = skip_spaces(next);
> @@ -346,8 +347,6 @@ static ssize_t event_trigger_regex_write(struct file *file,
>  	if (IS_ERR(buf))
>  		return PTR_ERR(buf);
>  
> -	strim(buf);
> -
>  	guard(mutex)(&event_mutex);
>  
>  	event_file = event_file_file(file);
> -- 
> 2.51.0
> 
> 


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