linux-kernel - Re: What about make mergeconfig ?

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Date:	Wed, 25 Oct 2006 12:01:20 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>
Cc:	"Linux Kernel list" <linux-kernel@...r.kernel.org>,
	"Sam Ravnborg" <sam@...nborg.org>
Subject: Re: What about make mergeconfig ?

On 25/10/06, Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> Hi folks !
>
> I'm not good enough at make and friends to do that myself without
> spending a lot more time than I have at hand, but I figured it might be
> something doable in a blink for whoever knows Kconfig guts :)
>
> What about something like:
>
> make mergeconfig <path_to_file>
>
> That would merge all entries in the specified file with the
> current .config. By mergeing, that basically means that rule:
>
> N + N = N
> m + N = m
> Y + N = Y
> m + Y = Y
>
> (that is, we basically take for each entry max(.config, merge file)
>
> The idea here is that on archs like powerpc, we have the ability to
> build kernels that can boot several platforms. However, the defconfigs
> we ship (g5_defconfig, pseries_defconfig, maple_defconfig, cell... ) are
> tailored for one platform.
>
> Now, if (for testing typically) I want to build a kernel that boots (and
> has all the necessary drivers) for both a g5 and a cell, I need to start
> from one of the defconfigs (the g5 one) and basically add in manually
> all the bits necessary from the other one (the cell one).
>
> Thus it might be useful to have a mecanism to automate that...
>
Hmm, wouldn't you only have to build that config once and then in the
future just use "make oldconfig" to keep it up-to-date with newer
kernels ?

-- 
Jesper Juhl <jesper.juhl@...il.com>
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