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Message-ID: <20090131212106.6e2e05b0@lxorguk.ukuu.org.uk>
Date:	Sat, 31 Jan 2009 21:21:06 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alexey Zaytsev <alexey.zaytsev@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [git pull] scheduler fixes

On Sat, 31 Jan 2009 19:08:47 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> On Sat, 2009-01-31 at 20:49 +0300, Alexey Zaytsev wrote:
> > 
> > And answering an earlier question, this happens only on i386 and only
> > with 4K stacks because x86_64 dosn't have a separate softirq stack,
> > so the preempt count diring the soft irq is at least IRQ_EXIT_OFFSET.
> 
> What do the other 30 odd architectures that Linux supports do? Is i386
> 4k really the _only_ with separate softirq stacks?

x86-64 and some of the other platforms could do with IRQ stacks but that
is another story.
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