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

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Message-ID: <4F10F3EF.8000908@linux.vnet.ibm.com>
Date:	Sat, 14 Jan 2012 08:48:07 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 01/14/2012 08:40 AM, Linus Torvalds wrote:

> 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.


Wow! Feels good to hear that, at last! :-)

By the way, in my excitement, while sending the patch I forgot to give
credits to the problem reporters with a "Reported-by". Hope that gets
resolved.

> 
>> 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.
> 


:-)
 
Regards,
Srivatsa S. Bhat
IBM Linux Technology Center

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