linux-kernel - Re: Cloning arch-independant KConfig

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Date:	Fri, 13 Aug 2010 03:20:52 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: Cloning arch-independant KConfig

On Thu, Aug 12, 2010 at 04:38:37PM -0700, Joel Becker wrote:
> Sam,
> 	I guess this is either a feature request or just wondering
> whether KConfig supports this idea.
> 	Often I have a wonderful minimal .config that builds a test
> kernel.  It only compiles the things I want in my kernel and modules,
> nothing more.  Usually I start from a distro kernel and then keep
> turning things off until I reach some minimum.
> 	However, when I get a new machine of a different architecture, I
> can't bring that work forward.  If I take this .config to that arch, the
> oldconfig just breaks.  I don't get good defaults for the arch-specific
> stuff.  Conversely, if I start from a distro .config for the new arch, I
> have to repeat all the whittle-down work.
> 	Is there any way to "extract" the non-arch-specific config
> values?  Essentially, all the "use USB, build ext3, give me these
> network cards" fields should be kept, but I want to start from a default
> architecture config.

Today there are a few ways you can do so already.
Say that you have saved away the known good one as "good", which is
a direct copy of your .config.

Then you can do for example:
KCONFIG_ALLCONFIG=good make alldefconfig

This will produce a config wich is almost equal to what you had before,
and with defaults for all new stuff.
I tested it where I used a sparc defconfig as input to a i386
config and it just worked.

Another possibility:
If you already have configured your kernel, but want to use
"good" but keep the settings for all the new stuff.
Then you can do:

cat .config good > new
mv new .config
make menuconfig

This will trigger a lot of override warnings - which you just ignore.
Resulting config is then mostly from "good".

We do not have a way to say "copy only non-arch specific settings".
So I hope the above is OK.

	Sam
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