Date: Sun, 17 Feb 2008 21:18:41 -0800
From: Arjan van de Ven <arjan@linux.intel.com>
To: "Brown, Len" <len.brown@intel.com>
Cc: "Laurent Riffard" <laurent.riffard@free.fr>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       <linux-kernel@vger.kernel.org>, "Stuart Bennett" <sb476@cam.ac.uk>
Subject: Re: 2.6.25-rc2-mm1: WARNING at arch/x86/mm/ioremap.c:129
Message-ID: <20080217211841.41643a21@laptopd505.fenrus.org>
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On Sun, 17 Feb 2008 23:58:03 -0500
"Brown, Len" <len.brown@intel.com> wrote:

> >Len: This WARN_ON says that ACPI is trying to call ioremap() 
> >on memory that the e820_table
> >lists as "kernel owned". Do you know why ACPI would do this? 
> >Would ACPI get upset if
> >the kernel would tell it to take a hike?
> 
> Depends on the BIOS -- as it is the BIOS AML that is making this
> request.

is there any possible valid scenario where the BIOS AML would touch memory the 
kernel is using? (Since that seems to be what is going on; I'll cook up a diagnostics
patch to get more info but the warning gets spewed if ioremap() is trying to map
memory the kernel sees as ram)


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