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

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Date:	Sat, 4 May 2013 21:59:50 +0200
From:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
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))

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).

Otherwise, I was not able to get the desired behviour with only the A
and B symbols.

Regards,
Yann E. MORIN.

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