linux-kernel - Re: [SOUND] hda

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Date:	Mon, 12 Mar 2007 15:43:10 +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 13:53:51 +0000,
Ralf Baechle wrote:
> 
> On Mon, Mar 12, 2007 at 12:04:30PM +0100, Takashi Iwai wrote:
> 
> > It's no big problem to remove const in these cases, but allowing const
> > with __devinitdata seems the right fix to me...
> 
> Gccs derives the readability of a section used with __attribute(section())
> from the first use, which in case of this driver was a non-const use, so
> gcc made .init.data a r/w section.  Later uses were marked with const,
> so did conflict.  Having to ensure that all members of a section are const
> or are not const is painful, so this is clearly less than desirable
> behaviour on gcc's side.  I think gcc picking the most permissive
> attributes for a section, that is r/w in this case would be far preferable.
> 
> Here is a small test case btw:
> 
> int foo __attribute__ ((__section__ (".init.data"))) = 23;
> const int bar __attribute__ ((__section__ (".init.data"))) = 42;
> 
> Now I'm not a great fan of the patch I've posted but it reflects what real
> world gcc is doing so for the time being I don't see much of a chance to
> The Right Thing (TM).  And the gain from const in this case will be small
> anyway.

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?

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.


Takashi
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