linux-kernel - Re: [PATCH v2] i2c: add tracepoints for I2C slave events

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Date:   Fri, 18 Mar 2022 09:58:17 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Wolfram Sang <wsa@...nel.org>
Cc:     Jae Hyun Yoo <quic_jaehyoo@...cinc.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Graeme Gregory <quic_ggregory@...cinc.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v2] i2c: add tracepoints for I2C slave events

On Fri, 18 Mar 2022 11:53:48 +0100
Wolfram Sang <wsa@...nel.org> wrote:


> > trace printings can be selected by adding a filter like:
> > 
> > 	echo adapter_nr==1 >/sys/kernel/tracing/events/i2c_slave/filter
> > 
> > Signed-off-by: Jae Hyun Yoo <quic_jaehyoo@...cinc.com>  
> 
> Steven, are you happy with the tracepoint parts of this patch?

Strange. I do not have v2 in my inbox anywhere. I checked the spam folders
and found nothing. I had a glitch in my mail server around this time and
maybe it was dropped then.

Let me take a look at it in my LMKL folder, which it appears to be there :-/

-- Steve


> 
> 
> > +	if (trace_i2c_slave_enabled() && !ret)
> > +		trace_i2c_slave(client, event, val);  
> 
> Why '!ret'? I think we should always print 'ret' in the trace as well.
> Backends are allowed to send errnos on WRITE_RECEIVED to NACK the
> reception of a byte. This is useful information, too, or?
> 
> Rest looks good to me.
> 
> Thanks,
> 
>    Wolfram
>