linux-kernel - Re: [PATCH 0/3] build system: section garbage collection for vmlinux

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Message-Id: <200709052014.12653.vda.linux@googlemail.com>
Date:	Wed, 5 Sep 2007 20:14:12 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	sam@...nborg.org, kai@...maschewski.name,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] build system: section garbage collection for vmlinux

On Wednesday 05 September 2007 19:38, Daniel Walker wrote:
> > > You version doesn't work with CONFIG_MODULES right?
> > 
> > It works with CONFIG_MODULES.
> 
> Really? Take a look at this version,
> 
> http://lkml.org/lkml/2006/6/4/169
> 
> Marcello had to implement a two pass build to add back symbol used in
> modules which got removed from the main kernel.. You don't appear to do
> that. Marcelo also claims better size reduction than you.

This will discard EXPORT_SYMBOLs potentially used by
out-of-tree modules.

I also saw ~10% size reductions, but then at run-time test modules
failed to load, they didn't find needed symbols.

OTOH if I know that I am not going to be using such modules,
then this can be done. Will require another CONFIG_xxx, though.
--
vda
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