linux-kernel - Re: [PATCH] ASoC: trace: track dapm type in snd_soc_dapm

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Date:   Wed, 8 Aug 2018 20:39:22 +0800
From:   "Liu, Changcheng" <changcheng.liu@...el.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     broonie@...nsource.wolfsonmicro.com, mingo@...hat.com,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] ASoC: trace: track dapm type in snd_soc_dapm_widget

On 08:24 Wed 08 Aug, Steven Rostedt wrote:
> On Wed, 8 Aug 2018 17:29:27 +0800
> "Liu, Changcheng" <changcheng.liu@...el.com> wrote:
> 
> > Track snd_soc_dapm_widget:id which is used as dapm
> > sequence index in dapm_down_seq/dapm_up_seq. It's
> > useful for checking dapm seq after tracking it.
> > 
> > Signed-off-by: Liu Changcheng <changcheng.liu@...el.com>
> > 
> > diff --git a/include/trace/events/asoc.h b/include/trace/events/asoc.h
> > index 40c300f..0bc935b 100644
> > --- a/include/trace/events/asoc.h
> > +++ b/include/trace/events/asoc.h
> > @@ -92,16 +92,18 @@ DECLARE_EVENT_CLASS(snd_soc_dapm_widget,
> >  
> >  	TP_STRUCT__entry(
> >  		__string(	name,	w->name		)
> > +		__field(	int,	id		)
> >  		__field(	int,	val		)
> >  	),
> >  
> >  	TP_fast_assign(
> >  		__assign_str(name, w->name);
> > +		__entry->id = w->id;
> >  		__entry->val = val;
> >  	),
> >  
> > -	TP_printk("widget=%s val=%d", __get_str(name),
> > -		  (int)__entry->val)
> > +	TP_printk("widget=%s dapm_id=%d val=%d", __get_str(name),
> > +		  (int)__entry->id, (int)__entry->val)
> 
> Not sure why it was there before, but the (int) typecast isn't needed
> in either case. __field(int, val) makes __entry->val of type int. Same
> for id.
> 
> -- Steve

@Steve: This patch aims at tracking the dapm up/down sequence. For the
(int) typecast format problem, what do you think of using another
seperate patch to resolve it?

-- Changcheng
> 
> >  );
> >  
> >  DEFINE_EVENT(snd_soc_dapm_widget, snd_soc_dapm_widget_power,
>