linux-kernel - Re: [PATCH] kbuild: Enable building defconfigs from Kconfig files

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Message-ID: <4C3CCB1C.40206@suse.cz>
Date:	Tue, 13 Jul 2010 22:22:52 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Linus <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH] kbuild: Enable building defconfigs from Kconfig files

On 07/13/2010 03:43 AM, Stephen Rothwell wrote:
> After this change, doing a "make xxx_defconfig" will check first for
> a file called arch/<arch>/configs/Kconfig.xxx and use that to generate
> the .config (effectively starting from an allnoconfig).  If that file
> doesn't exist, it will use arch/<ARCH>/configs/xxx_defconfig as now.
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  scripts/kconfig/Makefile |   14 +++++++++++++-
>  1 files changed, 13 insertions(+), 1 deletions(-)
> 
> Hi Linus,
> 
> Is this more the direction you want to take?
> 
> There are still 2 main problems with is approach:
> 
> 	- there are some config options that are globally and
> unconditionally enabled that some platforms may not want.  The only way
> currently to turn them off is to reproduce the config entry with the
> different default.  I am not sure if we need a wa to turn them off or to
> just change them to being neede to be selected by those that do want them.
> 	- we have no way to select options that are neither bool or
> tristate to suitable values.  Again the only way to do that currently is
> to reproduce the config entry with a different default value.

Hi Stephen,

how are these Kconfig.xxx files going look like? A list of 'select FOO'
 and 'include "Kconfig.other"' statements?

What about adding support for an include statement to the .config file
format and using that in the defconfigs instead? The VARIABLE=VALUE
grammar seems much more suitable for this than the kconfig language.

Michal
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