linux-kernel - Re: Fwd: Using select in boolean dependents of a tristate symbol

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Date:	Wed, 19 Jul 2006 16:50:56 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>
Cc:	"Roman Zippel" <zippel@...ux-m68k.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Fwd: Using select in boolean dependents of a tristate symbol

On 7/19/06, Valdis.Kletnieks@...edu <Valdis.Kletnieks@...edu> wrote:
> On Wed, 19 Jul 2006 16:17:38 EDT, Dmitry Torokhov said:
>
> > Another question for you  - what is the best way to describe
> > dependancy of a sub-option on a subsystem so you won't end up with the
> > subsystem as a module and user built in. Something like
> >
> > config IBM_ASM
> >         tristate "Device driver for IBM RSA service processor"
> >         depends on X86 && PCI && EXPERIMENTAL
> > ...
> > config IBM_ASM_INPUT
> >         bool "Support for remote keyboard/mouse"
> >         depends on IBM_ASM && (INPUT=y || INPUT=IMB_ASM)
> >
> > But the above feels yucky. Could we have something like:
> >
> >          depends on matching(INPUT, IBM_ASM)
>
> What feels yucky is the dependency of a 'bool' on a tristate.  Does the
> ASM_INPUT get used in places where the source file can only be a builtin,
> not a module?
>

In this case ASM_INPUT enables an optional part of a bigger module
(IBM_ASM). Sometimes it is done because optional part is too small to
be split into a separately loadable module or because it is difficult
to implement "attaching" of the optional part at the later time if it
is compiled as a module.

-- 
Dmitry
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