Re: [SOUND] hda_intel: build fix

[Ralf Baechle <ralf@linux-mips.org>]

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.

  Ralf