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Subject: RE: Warning during suspend with MS-7310 mainboard
Date: Thu, 30 Jul 2009 12:11:12 -0500
Message-ID: <6453C3CB8E2B3646B0D020C11261327303620A02@sausexmb4.amd.com>
In-Reply-To: <20090730164629.GC2593@redhat.com>
Thread-Topic: Warning during suspend with MS-7310 mainboard
thread-index: AcoRNVILUi/YIv/eRHe4xd7Sa4SntQAA1V6A
References: <1248936650.3313.6.camel@queen> <1248949671.3313.10.camel@queen> <20090730154734.GB2593@redhat.com> <6453C3CB8E2B3646B0D020C11261327303620A01@sausexmb4.amd.com> <20090730164629.GC2593@redhat.com>
From: "Langsdorf, Mark" <mark.langsdorf@amd.com>
To: "Dave Jones" <davej@redhat.com>
CC: "Eric Sesterhenn" <eric.sesterhenn@lsexperts.de>,
       <linux-kernel@vger.kernel.org>, <cpufreq@vger.kernel.org>,
       <rusty@rustcorp.com.au>
Sender: linux-kernel-owner@vger.kernel.org
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Lines: 27

> 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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