From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Justin P. Mattock" <justinmattock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: ohci1394_dma=early crash since 2.6.32 (was Re: [Bug	 #14487]
 PANIC: early exception 08 rip 246:10 error	 ffffffff810251b5 cr2 0)
Date: Thu, 04 Feb 2010 01:48:29 -0800
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To: Jan Beulich <JBeulich-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org>
Cc: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>, Dan Carpenter <error27-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, bernhard.kaindl-hi6Y0CQ0nG0@public.gmane.org, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, linux1394-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, Stefan Richter <stefanr-MtYdepGKPcBMYopoZt5u/LNAH6kLmebB@public.gmane.org>, Rafael Wysocki <rjw-KKrjLPT3xs0@public.gmane.org>, Kernel Testers List <kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, ebiderman-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org, hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org

On 02/04/10 01:35, Jan Beulich wrote:
>>>> "Justin P. Mattock"<justinmattock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  04.02.10 10:17>>>
>> so something is using __native_set_fixmap
>> that's hitting some memory address then
>> set_fixmap_nocache(ohci1394_dma=early)
>> fires off hitting the same?
>
> No, afaict it is the ohci1394_dma=early code itself hitting that path.
>
> Jan
>
>

alright.. looking at init_ohci1394_dma.c
I see:

ohci.registers = (void *)fix_to_virt(FIX_OHCI1394_BASE);

then I think it calls:

set_fixmap_nocache(FIX_OHCI1394_BASE, ohci_base);

I'm guessing somewhere with the fix_to_virt might be something
(but could be wrong);

Justin P. Mattock