To: Adrian Bunk <bunk@stusta.de>
Cc: =?iso-8859-1?q?J=F6rn_Engel?= <joern@wohnheim.fh-wedel.de>,
       Yum Rayan <yum.rayan@gmail.com>, linux-kernel@vger.kernel.org,
       mvw@planets.elm.net
Subject: Re: Stack usage tasks
References: <df35dfeb05033023394170d6cc@mail.gmail.com>
	<20050331150548.GC19294@wohnheim.fh-wedel.de>
	<20050331203010.GF3185@stusta.de>
From: Roland Dreier <roland@topspin.com>
Date: Thu, 31 Mar 2005 12:43:38 -0800
In-Reply-To: <20050331203010.GF3185@stusta.de> (Adrian Bunk's message of
 "Thu, 31 Mar 2005 22:30:10 +0200")
Message-ID: <52ll83mtqd.fsf@topspin.com>
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    > The task I'm suggesting was therefore:
    > - remove the -fno-unit-at-a-time in arch/i386/Makefile in your private
    >   kernel sources
    > - use gcc 3.4
    > - reduce the stack usages in call paths > 3kB

This is a good idea.  However, I might suggest using gcc 4.0 (you'll
have to use a snapshot now, but the release should only be a few weeks
away).  A patch went into gcc 4.0 that makes gcc more intelligent
about sharing stack for variables that cannot be alive at the same
time, and therefore it may be more feasible to make unit-at-a-time
work for the i386 kernels.

 - R.
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