Re: x86/mce: machine check warning during poweroff

[Greg KH]

On Sat, Jan 14, 2012 at 10:36:53PM -0500, Alan Stern wrote:
> 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@xxxxxxxxxxxxxxxxxxx> 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?

For some reason I thought it was documented somewhere, but I can't seem
to find that right now.  So yes, a patch documenting it would be great
to have.

thanks,

greg k-h
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