linux-kernel - Re: [PATCH 3/4] Add __global tag where needed.

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Message-ID: <20060825102649.GU19810@stusta.de>
Date:	Fri, 25 Aug 2006 12:26:49 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Add __global tag where needed.

On Fri, Aug 25, 2006 at 10:52:26AM +0100, David Woodhouse wrote:
> On Thu, 2006-08-24 at 23:30 +0200, Adrian Bunk wrote:
> > Applying this doesn't seem to make much sense until it's clear whether a
> > "build everything except for assembler files at once" approach (that 
> > needs less globals) or your current "compile only multi-obj at once" 
> > approach (that requires more globals). 
> 
> For the kernel itself, I think that building a directory at once is the
> way forward. For modules, obviously the scope is more limited.

For any desktop or server you buy today your patches are a nice 
improvement but not that important.

But projects like embedded systems or OLPC that really need want 
kernels should be the same projects that already avoid the
10% size penalty of CONFIG_MODULES=y.

> Either way, I'd like to prevent the unnecessary proliferation of
> __global by instrument the link process somehow so that we get a
> _warning_ during the final link if there are any global symbols which
> aren't actually used.
>...

That would give many false positives from files like fs/libfs.c .

> dwmw2

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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