linux-kernel - Re: [SOUND] hda

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Date:	Mon, 12 Mar 2007 17:38:51 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, perex@...e.cz,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [SOUND] hda_intel: build fix

At Mon, 12 Mar 2007 15:46:47 +0000,
Ralf Baechle wrote:
> 
> On Mon, Mar 12, 2007 at 03:43:10PM +0100, Takashi Iwai wrote:
> 
> > Fair enough.  I agree that removing const is the only reasonable fix
> > right now.   But from semantics, const is a good thing, and people may
> > try to add it again later if we get rid of them now.  So, how about to
> > comment out such as /*const*/ in each place to remind that it's
> > intentional?
> 
> I consider that harder to read and uglier.  If anything maybe something
> like:
> 
> #define __const_devinit
> [...]
> static __const_devinit struct snd_kcontrol_new snd_ice1712_delta1010lt_wordclock_status __devinitdata =
> 
> Worth it?  I doubt.

Well that's really a taste of matter...

> > Also, in your patch to ice1712, you don't have to remove const from the
> > codes in snd_ice1712_read_eeprom() and snd_ice1712_probe() functions.
> > They should work as const pointer.
> 
> No, that results in warnings:
> 
>   CC      sound/pci/ice1712/ice1712.o
> sound/pci/ice1712/ice1712.c: In function ‘snd_ice1712_read_eeprom’:
> sound/pci/ice1712/ice1712.c:2354: warning: assignment from incompatible pointer type
> sound/pci/ice1712/ice1712.c: In function ‘snd_ice1712_probe’:
> sound/pci/ice1712/ice1712.c:2693: warning: assignment from incompatible pointer type

Ah, that's a nasty part of C const.  It should be like
	const struct snd_ice1712_card_info *c;
but for pointer-of-pointer, something like
	struct snd_ice1712_card_info * const *tbl;
...?


Takashi
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