linux-kernel - Re: [tip:x86/irq] x86: Always use irq stacks

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Message-ID: <alpine.LFD.2.00.1007141719130.3321@localhost.localdomain>
Date:	Wed, 14 Jul 2010 17:27:01 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Christoph Hellwig <hch@....de>
cc:	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
	rostedt@...dmis.org
Subject: Re: [tip:x86/irq] x86: Always use irq stacks

On Wed, 14 Jul 2010, Christoph Hellwig wrote:

> Turns out this wasn't a regression introduced by a commit, but it
> happens when CONFIG_FUNCTION_GRAPH_TRACER is enabled.  From a quick
> look I have no idea why these would interact badly, especially as
> CONFIG_FUNCTION_GRAPH_TRACER works fine with irq stacks if the
> CONFIG_4KSTACKS options is set.

So you're saying, that the problem appears when
CONFIG_FUNCTION_GRAPH_TRACER is enabled w/o being used and that it
exists prior to your patches with irq stacks and 8k stack size, but
works with 4k stacks. That's definitely more than odd.

Thanks,

	tglx

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