linux-kernel - Re: [PATCH 0/3] removing unwanted module configs

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Message-ID: <alpine.DEB.2.00.0904300932380.20374@gandalf.stny.rr.com>
Date:	Thu, 30 Apr 2009 09:42:12 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Theodore Tso <tytso@....edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	zippel@...ux-m68k.org, linux-kbuild@...r.kernel.org,
	Sam Ravnborg <sam@...nborg.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 0/3] removing unwanted module configs

On Thu, 30 Apr 2009, Ingo Molnar wrote:
> 
> CONFIG_IKCONFIG=y would be a one-off thing, only to make the whole 
> concept self-hosting. If i boot a localyesconfig kernel, how does 
> the script figure out what is built in? It cannot, unless i provide 
> it the precise .config - but often that wont be provided. The script 
> should clone the environment it is running in really.

Does IKCONFIG get loaded in the running kernel if IKCONFIG_PROC is not 
set, or does it just sit in the vmlinux file.

Since this option can also be used for helping embedded developers (I used 
it for that) I would not want to bloat the kernel with running a script 
that is suppose to minimize it. But if IKCONFIG && !IKCONFIG_PROC does not 
add more data to the kernel, then I would be happy to turn it on by 
default.

I see I can use scripts/extract-ikconfig to get the config from the 
current image. Now which image should it try?

/boot/vmlinuz-`uname -r`
./vmlinux

I could have it first try /proc/config.gz and if it does not find it then
try the /boot kernel, if it does not find it or does not find a config 
file in it, it would then try ./vmlinux file. If it does not find the file 
or the config then it would just use the local .config.

-- Steve

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