linux-kernel - Re: x86/mce: machine check warning during poweroff

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Message-ID: <CA+55aFwWU8ieuV_EsA6nHwjV9iOgy04DEScngDKQ92wNGfPZ-Q@mail.gmail.com>
Date:	Fri, 13 Jan 2012 19:10:27 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Ming Lei <tom.leiming@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Borislav Petkov <borislav.petkov@....com>,
	Tony Luck <tony.luck@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	gouders@...bocholt.fh-gelsenkirchen.de,
	Marcos Souza <marcos.mage@...il.com>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	prasad@...ux.vnet.ibm.com, justinmattock@...il.com,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mgorman@...e.de>,
	Gilad Ben-Yossef <gilad@...yossef.com>
Subject: Re: x86/mce: machine check warning during poweroff

On Fri, Jan 13, 2012 at 7:05 PM, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
>> On Fri, Jan 13, 2012 at 6:41 PM, Srivatsa S. Bhat
>> <srivatsa.bhat@...ux.vnet.ibm.com> wrote:
>>
>>> The patch below works perfectly for me - I tested multiple CPU hotplug
>>> operations as well as multiple pm_test runs at core level. Please let me
>>> know if this solves the suspend issue as well..
>>
>> Ok, I'll try, and I bet it does.

Yup, I can suspend and resume multiple times now.

> I totally agree with you. Even I had set out to find out *exactly* what
> was going wrong. After spending significant amount of time digging through
> the code (unsuccessfully), this idea of zeroing out everything struck me
> and it worked, as expected. Yes, it is definitely important to know the
> exact issue so that we can fix the driver core and avoid other mishaps,
> but I guess finding that out is not all that simple.. as of now I am
> rather exhausted following those zillions of pointers continuously
> for the past few hours.. ;-/

Fair enough. The many layers of clever indirection are really really
nasty to follow, I agree.

                   Linus
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