linux-kernel - Re: kerneloops.org report for the week of June 14 2009

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Date:	Tue, 23 Jun 2009 18:58:43 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Len Brown <lenb@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: kerneloops.org report for the week of June 14 2009

On Tue, 23 Jun 2009, Rafael J. Wysocki wrote:
> The long term solution for the issue at hand is to clean up the suspend-resume
> support in cpufreq so that it doesn't do stupid things like calling
> smp_call_function_single() with interrupts disabled, but that requires someone
> (I can do it, but I need to dig through the cpufreq code for this purpose) to
> figure out how to fix it.
> 
> I'm not quite sure if there's an acceptable short term solution, though.
> 
> In principle we can do
> 
> local_irq_save()
> ...
> local_irq_restore()
> 
> around each sysdevs ->susend() and ->resume() in addition to checking the
> status of interrupts.  Would that work?

Well not really, if the function enables interrupts you run into the
same issue (interrupt service routine calls ktime_get()) again.

Thanks,

	tglx
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