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Date: Thu, 3 Apr 2008 20:18:30 +0200
From: Sam Ravnborg <sam@ravnborg.org>
To: Josh Boyer <jwboyer@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       davej@redhat.com
Subject: Re: Linux 2.6.25-rc8
Message-ID: <20080403181830.GA32397@uranus.ravnborg.org>
References: <alpine.LFD.1.00.0804011257310.14670@woody.linux-foundation.org> <18418.44094.156352.405647@cargo.ozlabs.ibm.com> <alpine.LFD.1.00.0804020748100.14670@woody.linux-foundation.org> <18420.22563.895489.490165@cargo.ozlabs.ibm.com> <1207227337.3224.6.camel@vader.jdub.homelinux.org>
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> 
> > Those defconfigs would be much smaller and change much less often if
> > they could be expressed as a delta from some other defconfig.  So we'd
> > end up with a small number of base defconfigs plus a set of board
> > defconfigs that would say effectively "use the options from that other
> > defconfig, plus turn this on and that off".
> 
> IIRC, Fedora builds their kernels using such a mechanism, though it's
> done in the RPM specfile with a perl script.  Maybe that's something to
> look at to start with.
kconfig allready allow you to override values simply by appending to
the end of the .config file.
So it is a matter of creating the proper stuff around to:
1) use it
2) make is simple to update defconfigs
   A simple extract delta between two config

I'm not up to do that at the moment - but it is doable.
And I would hate to see the defconfig disappear just because
they are so visible in Linus' dirstat.
	Sam