linux-kernel - RE: Warning during suspend with MS-7310 mainboard

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Message-ID: <6453C3CB8E2B3646B0D020C11261327303620A02@sausexmb4.amd.com>
Date:	Thu, 30 Jul 2009 12:11:12 -0500
From:	"Langsdorf, Mark" <mark.langsdorf@....com>
To:	"Dave Jones" <davej@...hat.com>
CC:	"Eric Sesterhenn" <eric.sesterhenn@...xperts.de>,
	<linux-kernel@...r.kernel.org>, <cpufreq@...r.kernel.org>,
	<rusty@...tcorp.com.au>
Subject: RE: Warning during suspend with MS-7310 mainboard

> On Thu, Jul 30, 2009 at 11:38:22AM -0500, Langsdorf, Mark wrote:
>  > I'll look into it.
>  > 
>  > First time I've had this bug reported, though.
>  > 
> 
> It's happening because the suspend code runs with interrupts disabled,
> and the powerpc workaround we do in the cpufreq suspend hook
> calls the drivers ->get method.
> 
> powernow-k8's ->get does an smp_call_function_single
> which needs interrupts enabled
> 
> If we just make the suspend code conditional on ppc, this 
> whole problem goes away.

Oh, thanks for the clarification.

-Mark Langsdorf
Operating System Research Center
AMD

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