linux-kernel - Re: [PATCH] Allow linker to eliminate unused functions in lib/*

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Message-ID: <20100110231708.GC4019@discord.disaster>
Date:	Mon, 11 Jan 2010 10:17:08 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Allow linker to eliminate unused functions in lib/*

On Sat, Jan 09, 2010 at 05:51:56PM +0100, Andi Kleen wrote:
> > Sneaky.
> > 
> > It's a bit sad to reduce the code cleanliness and maintainability in
> > this way, but 1k is 1k.
> 
> Yes. I had actually hoped for more too. I think it might bring 
> more with -ffunction-sections/--gc-sections, but I haven't tried that.
> 
> An alternative might be also to give some more of those explicit Kconfig
> symbols -- then kernels with module loading enabled would benefit more
> too -- but I haven't investigated how many changes that would need.
> 
> But even with that it's a reasonable improvement and putting the exports
> separately is not too bad.
> 
> > The patch assumes a pre-existing lib-syms.c.  Confused.
> 
> Sorry, some day I'll learn how to operate quilt properly.
> 
> Updated patch with all files included appended.

Andi, how do you want to handle the overlap between this and the
list_sort() patch I sent? I'm going to need a list_sort() available
in the XFS tree well before the 2.6.34 merge window....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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