linux-kernel - Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

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Message-ID: <20070717170127.GJ11781@holomorphy.com>
Date:	Tue, 17 Jul 2007 10:01:27 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Ray Lee <ray-lk@...rabbit.org>,
	Rene Herman <rene.herman@...il.com>,
	Bodo Eggert <7eggert@....de>, Matt Mackall <mpm@...enic.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Chinner <dgc@....com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

At some point in the past, I wrote:
>> If at some point one of the pro-4k stacks crowd can prove that all
>> code paths are safe, or introduce another viable alternative (such as
>> Matt's idea for extending the stack dynamically), then removing the 8k
>> stacks option makes sense.

On Mon, Jul 16, 2007 at 11:54:38PM +0100, Alan Cox wrote:
> Any x86-32 path unsafe with 4K stacks is almost certainly unsafe with 8K
> stacks because the 8K stacks do not have seperate IRQ stack paths, so you
> have the same space but split. It might be less predictable on 8K stacks
> but it isn't absent.

At hch's suggestion I rewrote the separate IRQ stack configurability
patch into one making IRQ stacks mandatory and unconfigurable, and
hence enabled with 8K stacks.


-- wli
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