linux-kernel - Re: [PATCH v4] tools/rtla: Add osnoise_trace_is

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Message-ID: <435c4d70-3a7a-41d2-b49a-9de7cdb77c14@stanley.mountain>
Date: Fri, 17 Jan 2025 08:08:10 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Costa Shulyupin <costa.shul@...hat.com>,
	Daniel Bristot de Oliveira <bristot@...nel.org>,
	John Kacur <jkacur@...hat.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
	Eder Zulian <ezulian@...hat.com>, Tomas Glozar <tglozar@...hat.com>,
	Gabriele Monaco <gmonaco@...hat.com>,
	linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] tools/rtla: Add osnoise_trace_is_off()

On Thu, Jan 16, 2025 at 07:34:32PM -0500, Steven Rostedt wrote:
> On Wed, 15 Jan 2025 21:40:40 +0300
> Dan Carpenter <dan.carpenter@...aro.org> wrote:
> 
> > On Wed, Jan 15, 2025 at 07:58:30PM +0200, Costa Shulyupin wrote:
> > > The original code accidentally works because offset of
> > > `record->trace` is zero.  
> > 
> > It doesn't "accidentally work".  The people who write this kind of
> > code 100% understand what they are doing.  They don't see it as
> > anything complicated.
> 
> I'm taking this patch but I replaced the change log with the following text:
> 
>     tools/rtla: Add osnoise_trace_is_off()
>     
>     All of the users of trace_is_off() passes in &record->trace as the second
>     parameter, where record is a pointer to a struct osnoise_tool. This record
>     could be NULL and there is a hidden dependency that the trace field is the
>     first field to allow &record->trace to work with a NULL record pointer.
>     
>     In order to make this code a bit more robust, as record shouldn't be
>     dereferenced if it is NULL, even if the code does work, create a new
>     function called osnoise_trace_is_off() that takes the pointer to a
>     struct osnoise_tool as its second parameter. This way it can properly test
>     if it is NULL before it dereferences it.
>     
>     The old function trace_is_off() is removed and the function
>     osnoise_trace_is_off() is added into osnoise.c which is what the
>     struct osnoise_tool is associated with.

Thanks!

regards,
dan carpenter