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

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Message-Id: <1156502078.2984.81.camel@pmac.infradead.org>
Date:	Fri, 25 Aug 2006 11:34:38 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Add __global tag where needed.

On Fri, 2006-08-25 at 12:26 +0200, Adrian Bunk wrote:
> 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.

Yes, I agree -- although I haven't tested for performance yet; there
_may_ be something surprisingly improved in there but I suspect it's
unlikely.

> 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.

OLPC has USB ports and wants to be fairly flexible about being able to
connect stuff -- I don't think we can turn off CONFIG_MODULES in its
running kernel. However, its _boot_ kernel (LinuxBIOS) has
CONFIG_MODULES=n, and that's where we _really_ care about the space.

-- 
dwmw2

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