linux-kernel - Re: Splitting stk1160-ac97 as a module (Re: linux-next: Tree for May 1 (media/usb/stk1160))

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Date:	Mon, 6 May 2013 10:11:52 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Ezequiel García <elezegarcia@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media <linux-media@...r.kernel.org>,
	linux-kbuild@...r.kernel.org
Subject: Re: Splitting stk1160-ac97 as a module (Re: linux-next: Tree for May
 1 (media/usb/stk1160))

On Sat, May 04, 2013 at 09:59:50PM +0200, Yann E. MORIN wrote:
> Ezequiel, All,
> 
> On Sat, May 04, 2013 at 02:21:44PM -0300, Ezequiel Garcia wrote:
> > I'm trying to split the ac97 support into a separate module.
> > So far I've managed to do this with two different approaches,
> > but both of them are broken in some way :-(
> > 
> > Couple questions:
> > 
> > 1. Is it possible to force two symbols to be both built-in (=y) or both
> > modules (=m)? This would make one of my solutions work.
> 
> If they are always the same value, there is no need to have two symbols
> in the first place.
> 
> However, given the original problem from this thread, if what you meant
> was to have the second symbol either 'n' or the same as the first symbol,
> ie. the following table:
> 
>     A:  n   m   m   y   y
>     B:  n   n   m   n   y
> 
> Then the closest I came up with is:
> 
>     config MODULES
>         bool "Modules"
>     
>     config A
>         tristate "A"
>     
>     config B_dummy
>         bool "B"
>         depends on A
>     
>     config B
>         tristate
>         default m if A=m && B_dummy
>         default y if A=y && B_dummy
> 
> where B_dummy is not used outside of Kconfig, and only A and B are the
> symbols of interest (eg. to build the drivers).
> 

That worked like a charm!

Thanks a lot,
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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