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

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Message-ID: <9a8748490707171639r41c085bfh857c5047a792dd0@mail.gmail.com>
Date:	Wed, 18 Jul 2007 01:39:09 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"William Lee Irwin III" <wli@...omorphy.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"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>,
	"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...?

On 17/07/07, William Lee Irwin III <wli@...omorphy.com> wrote:
> 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.
>
For what it's worth, that sounds good to me - like something that we
would want merged.

-- 
Jesper Juhl <jesper.juhl@...il.com>
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