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

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Date:	Sat, 14 Jan 2012 22:36:53 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <gregkh@...e.de>
cc:	Tony Luck <tony.luck@...el.com>,
	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, 14 Jan 2012, Greg KH wrote:

> 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.

These are both important restrictions on the use of the driver core,
and they don't seem to be explained anywhere in the kernel source.  
Would you like to receive a documentation patch?

Alan Stern

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