linux-kernel - Re: [alsa-devel] Improving or replacing snd

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Date:	Fri, 31 May 2013 10:24:51 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Takashi Iwai <tiwai@...e.de>
cc:	Joe Perches <joe@...ches.com>, Jaroslav Kysela <perex@...ex.cz>,
	<alsa-devel@...a-project.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] Improving or replacing snd_printk()

On Fri, 31 May 2013, Takashi Iwai wrote:

> > I don't see the complexity/hell in adding functions
> > for specific types of struct * to reduce the complexity
> > of the code though.  Centralizing those indirections
> > into functions also generally reduces overall code size.
> 
> I don't mind to add the struct pointer to new snd_*() -- if we really
> introduce them.  The bigger question is whether we really need to
> introduce such, and if yes, what variants.  And for that, I don't
> think we need to add many functions.  Maybe snd_card_<level>() would
> be good.  But others don't seem to make sense to me (remember that I
> suggest dropping CONFIG_SND_VERBOSE_PRINTK).

struct snd_card contains pointers to two different devices: dev and 
card_dev.  Some contexts might want to use one of them for log messages 
while other contexts might want to use the other.

I guess defining snd_card_*() to use card->card_dev makes the most 
sense.  If some code wants to use card->dev instead, it can pass that 
as the first argument to dev_*().

The most commonly used levels seem to be err, warn, info, and dbg.  
Those ought to be enough.  In fact, you probably could getting along 
without warn -- just err, info, and dbg.

Alan Stern

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