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

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Message-ID: <20120115023404.GA4268@suse.de>
Date:	Sat, 14 Jan 2012 18:34:04 -0800
From:	Greg KH <gregkh@...e.de>
To:	Tony Luck <tony.luck@...el.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Ming Lei <tom.leiming@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Borislav Petkov <borislav.petkov@....com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>,
	linux-kernel@...r.kernel.org, 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 Sat, Jan 14, 2012 at 06:05:24PM -0800, Tony Luck wrote:
> On Sat, Jan 14, 2012 at 8:30 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> > The driver core isn't designed to handle device structures that get
> > unregistered and then spring back to life; callers are supposed to
> > allocate a fresh new structure instead.
> 
> Does every caller use "kzalloc()" for this fresh new structure (or even
> for the original registration) rather than "kmalloc()"?

They better, as that's what they are required to do :)

The kernel would be crashing with slab debugging enabled, if it wasn't
so today.

thanks,

greg k-h
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