linux-kernel - Re: [PATCH] add consts where appropriate in sound/pci/hda/*

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Message-Id: <200709142034.59802.vda.linux@googlemail.com>
Date:	Fri, 14 Sep 2007 20:34:59 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] add consts where appropriate in sound/pci/hda/*

On Friday 14 September 2007 19:09, Joe Perches wrote:
> On Fri, 2007-09-14 at 18:48 +0100, Denys Vlasenko wrote:
> 
> > Patch is attached.
> 
> The SND_HDA_PRESETS define doesn't seem useful.
> It's only used once.

It is defined in .h file and used in .c file.

It is made so because defining static data variables in .h file
is a bad style in general and in this case will result in build-time
warnings in particular.

Therefore definition of hda_preset_tables[] is moved to .c file.

It looks like this:

static const struct hda_codec_preset *const hda_preset_tables[] = {
       snd_hda_preset_realtek,
       snd_hda_preset_cmedia,
       snd_hda_preset_analog,
       snd_hda_preset_sigmatel,
       snd_hda_preset_si3054,
       snd_hda_preset_atihdmi,
       snd_hda_preset_conexant,
       snd_hda_preset_via,
       NULL
};

I want to make it easier for people to add new snd_hda_preset_XXX.

I don't want them to be forced to add it in hda_patch.h first,
and then go to hda_codec.c and add it there too.

Therefore I turned this list into a #define which sits in hda_patch.h:

#define SND_HDA_PRESETS \
       snd_hda_preset_realtek, \
       snd_hda_preset_cmedia, \
       snd_hda_preset_analog, \
       snd_hda_preset_sigmatel, \
       snd_hda_preset_si3054, \
       snd_hda_preset_atihdmi, \
       snd_hda_preset_conexant, \
       snd_hda_preset_via

Now if you want to add yet another snd_hda_preset_XXX, you
don't need to touch hda_codec.c.

Original code was achieving the same by cheating: it has

static const struct hda_codec_preset *hda_preset_tables[] = {...}

in hda_patch.h.
--
vda
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