linux-kernel - Re: [PATCH v2 1/3] PM: Introduce DEVFREQ: generic DVFS framework with device-specific OPPs

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Date:	Wed, 18 May 2011 22:29:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	myungjoo.ham@...il.com, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Mark Brown <broonie@...ena.org.uk>,
	Jiejing Zhang <kzjeef@...il.com>,
	Colin Cross <ccross@...gle.com>, Nishanth Menon <nm@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH v2 1/3] PM: Introduce DEVFREQ: generic DVFS framework with device-specific OPPs

On Wednesday, May 18, 2011, Pavel Machek wrote:
> Hi!
> 
> > > >> +#define dev_dbg_once(dev, fmt, ...)                          \
> > > >> +     if (!once) {                                            \
> > > >> +             once = 1;                                       \
> > > >> +             dev_dbg(dev, pr_fmt(fmt), ##__VA_ARGS__);       \
> > > >> +     }
> > > >
> > > > Why do you need this?
> > > >
> > > 
> > > This devfreq_do is going to be called periodically; thus, I want to
> > > print a message if there is an error, but not too many messages with
> > > the repeated calls.
> > > 
> > > Besides, I'd change the macro like this:
> > > 
> > > #define dev_dbg_once(dev, fmt, ...)                          \
> > >      {                                                                \
> > >              static int once;                                   \
> > >              if (!once) {                                            \
> > >                      once = 1;                                       \
> > >                      dev_dbg(dev, pr_fmt(fmt), ##__VA_ARGS__);       \
> > >              }                                                 \
> > >      }
> > > 
> > > so that "static int once;" in functions can be removed.
> > 
> > That's a good change in my opinion, but since there is the dynamic debug
> > feature, I don't think you need to worry too much about that (the user
> > can always disable output from those dev_dbg() statements if they generate
> > too much noise).
> 
> Well... we do print-once in other places, too. And that way, we can
> maybe enable those prints by default...

I'm not sure what you mean?

Rafael
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