linux-kernel - Re: [bug] PCI hotplug, ibmphp_access_ebda: WARNING: at arch/x86/mm/ioremap.c:182 __ioremap

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Date:	Mon, 28 Jul 2008 21:26:55 -0700
From:	Greg KH <greg@...ah.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	the arch/x86 maintainers <x86@...nel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [bug] PCI hotplug, ibmphp_access_ebda: WARNING: at
	arch/x86/mm/ioremap.c:182 __ioremap_caller+0x2d1/0x340()

On Mon, Jul 28, 2008 at 03:31:32PM -0700, Jesse Barnes wrote:
> On Saturday, July 26, 2008 6:15 am Ingo Molnar wrote:
> > FYI, -tip testing triggered the new warning below on a testbox. I
> > suspect it's related to recent commits in drivers/pci/hotplug/.
> > I'm wondering, why does a driver map the EBDA? That's a really lowlevel
> > thing.
> 
> AFAICT, this driver digs around in there for hotplug controller configuration 
> (cc'ing Greg since he appears to be one of the original authors).  It's a 
> custom platform driver too, that may be the only method available there.  Is 
> there a shadow copy of the EDBA somewhere we should be using instead?

Yeah, that's a real low-level driver, so it probably has to do this kind
of thing.  I no longer have access to hardware that uses this driver,
try poking Gary (the 2.4 pci hotplug maintainer), he probably knows more
about it now.

thanks,

greg k-h
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