linux-kernel - Re: [PATCH] tracing: Have all triggers expect a file parameter

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Message-ID: <8c8a7f4a29a837813ded64c93cf689b9e5b5a56d.camel@kernel.org>
Date: Sun, 08 Feb 2026 16:49:21 -0600
From: Tom Zanussi <zanussi@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>, LKML
 <linux-kernel@...r.kernel.org>,  Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
	 <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH] tracing: Have all triggers expect a file parameter

Hi Steve,

On Fri, 2026-02-06 at 10:13 -0500, Steven Rostedt wrote:
> From: Steven Rostedt <rostedt@...dmis.org>
> 
> When the triggers were first created, they may not have had a file
> parameter passed to them and things needed to be done generically.
> 
> But today, all triggers have a file parameter passed to them. Remove the
> generic code and add a "if (WARN_ON_ONCE(!file))" to each trigger.
> 

Makes sense.

Reviewed-by: Tom Zanussi <zanussi@...nel.org>

> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>  kernel/trace/trace_events_trigger.c | 62 +++++++++++------------------
>  1 file changed, 24 insertions(+), 38 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> index 06b75bcfc7b8..7fa26327c9c7 100644
> --- a/kernel/trace/trace_events_trigger.c
> +++ b/kernel/trace/trace_events_trigger.c
> @@ -1347,18 +1347,13 @@ traceon_trigger(struct event_trigger_data *data,
>  {
>  	struct trace_event_file *file = data->private_data;
>  
> -	if (file) {
> -		if (tracer_tracing_is_on(file->tr))
> -			return;
> -
> -		tracer_tracing_on(file->tr);
> +	if (WARN_ON_ONCE(!file))
>  		return;
> -	}
>  
> -	if (tracing_is_on())
> +	if (tracer_tracing_is_on(file->tr))
>  		return;
>  
> -	tracing_on();
> +	tracer_tracing_on(file->tr);
>  }
>  
>  static bool
> @@ -1368,13 +1363,11 @@ traceon_count_func(struct event_trigger_data *data,
>  {
>  	struct trace_event_file *file = data->private_data;
>  
> -	if (file) {
> -		if (tracer_tracing_is_on(file->tr))
> -			return false;
> -	} else {
> -		if (tracing_is_on())
> -			return false;
> -	}
> +	if (WARN_ON_ONCE(!file))
> +		return false;
> +
> +	if (tracer_tracing_is_on(file->tr))
> +		return false;
>  
>  	if (!data->count)
>  		return false;
> @@ -1392,18 +1385,13 @@ traceoff_trigger(struct event_trigger_data *data,
>  {
>  	struct trace_event_file *file = data->private_data;
>  
> -	if (file) {
> -		if (!tracer_tracing_is_on(file->tr))
> -			return;
> -
> -		tracer_tracing_off(file->tr);
> +	if (WARN_ON_ONCE(!file))
>  		return;
> -	}
>  
> -	if (!tracing_is_on())
> +	if (!tracer_tracing_is_on(file->tr))
>  		return;
>  
> -	tracing_off();
> +	tracer_tracing_off(file->tr);
>  }
>  
>  static bool
> @@ -1413,13 +1401,11 @@ traceoff_count_func(struct event_trigger_data *data,
>  {
>  	struct trace_event_file *file = data->private_data;
>  
> -	if (file) {
> -		if (!tracer_tracing_is_on(file->tr))
> -			return false;
> -	} else {
> -		if (!tracing_is_on())
> -			return false;
> -	}
> +	if (WARN_ON_ONCE(!file))
> +		return false;
> +
> +	if (!tracer_tracing_is_on(file->tr))
> +		return false;
>  
>  	if (!data->count)
>  		return false;
> @@ -1481,10 +1467,10 @@ snapshot_trigger(struct event_trigger_data *data,
>  {
>  	struct trace_event_file *file = data->private_data;
>  
> -	if (file)
> -		tracing_snapshot_instance(file->tr);
> -	else
> -		tracing_snapshot();
> +	if (WARN_ON_ONCE(!file))
> +		return;
> +
> +	tracing_snapshot_instance(file->tr);
>  }
>  
>  static int
> @@ -1570,10 +1556,10 @@ stacktrace_trigger(struct event_trigger_data *data,
>  {
>  	struct trace_event_file *file = data->private_data;
>  
> -	if (file)
> -		__trace_stack(file->tr, tracing_gen_ctx_dec(), STACK_SKIP);
> -	else
> -		trace_dump_stack(STACK_SKIP);
> +	if (WARN_ON_ONCE(!file))
> +		return;
> +
> +	__trace_stack(file->tr, tracing_gen_ctx_dec(), STACK_SKIP);
>  }
>  
>  static int