linux-kernel - Re: kconfig `bool' (was: Re: [PATCH 13/13] fix ps3fb glue allowing a modular build)

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Date:	Tue, 20 Mar 2007 22:16:35 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@....linux.org.uk>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: kconfig `bool' (was: Re: [PATCH 13/13] fix ps3fb glue allowing
 a modular build)


On Mar 20 2007 22:06, Geert Uytterhoeven wrote:
>> 
>> Maybe not "bool" vs "mbool", but it might be nice to have
>> 
>> 	bool FB_PS3
>> 		depends strictly on FB
>> 
>> ie a "depends strictly" refuses to upgrade a bool dependency from "m" to 
>> "y", while a regular depends allows it.
>> 
>> Or something.. The "depends strictly on X" thing would really be just a 
>> mental shorthand for "depends on (X)=y" (it's actually longer to type, but 
>> I think it's a bit more intuitive, thus "mental shortcut").
>
>I've been thinking about this a bit more...
>
>Kconfig knows about the following types:
>  o bool
>  o tristate
>  o string
>  o hex
>  o int
>
>However, from a semantical point of view, they can be subdivided in 2 classes:
>  1. driver/subsystem/library enablers (i.e. things that are used in a Makefile
>     to decide whether to compile a unit or not):
>       o tristate (y=builtin, m=loadable, n=disabled)
>       o bool (y=builtin, n=disabled)
>  2. options (i.e. things that control some features, limits, or default
>     values):
>       o bool (y=true, n=false)
>       o string (literal)
>       o hex (literal)
>       o int (literal)
>
>The confusion arises from the 2 different semantics for `bool': for the former,
>a `depends on' obviously cannot be `builtin' if the dependency is `modular',
>while for the latter, it can be `true' if the dependency is `modular'.

I think it was once (is still?) possible to have something like

  <M> Foo
      <*> Bar

which would mean: include bar.o into foo.ko. If one chose to

  <M> Foo
      <M> Bar

you'd get foo.ko and bar.ko, with a modinfo dependency of course.



Jan
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