linux-kernel - Re: [PATCH v12 3/6] tracing: Add snapshot refcount

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Message-Id: <20240126093257.b6059a4c4fa1b1d345132350@kernel.org>
Date: Fri, 26 Jan 2024 09:32:57 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Vincent Donnefort <vdonnefort@...gle.com>
Cc: rostedt@...dmis.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
 kernel-team@...roid.com
Subject: Re: [PATCH v12 3/6] tracing: Add snapshot refcount

Hi Vincent,

On Thu, 25 Jan 2024 14:53:40 +0000
Vincent Donnefort <vdonnefort@...gle.com> wrote:

> > > @@ -1470,12 +1483,20 @@ register_snapshot_trigger(char *glob,
> > >  			  struct event_trigger_data *data,
> > >  			  struct trace_event_file *file)
> > >  {
> > > -	if (tracing_alloc_snapshot_instance(file->tr) != 0)
> > > +	if (tracing_arm_snapshot(file->tr))
> > >  		return 0;
> > 
> > BTW, is this return value correct? It seems that the register_*_trigger()
> > will return error code when it fails.
> 
> It should indeed be 
> 
>  ret = tracing_arm_snapshot()
>  if (ret)
>      return ret;

OK, then there is a bug. We need to fix it before changing this
for backporting.

Thank you,

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