linux-kernel - Re: ohci1394_dma=early crash since 2.6.32 (was Re: [Bug #14487] PANIC: early exception 08 rip 246:10 error ffffffff810251b5 cr2 0)

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Message-ID: <4B6A97ED.6080605@gmail.com>
Date:	Thu, 04 Feb 2010 01:48:29 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	Ingo Molnar <mingo@...e.hu>, Dan Carpenter <error27@...il.com>,
	bernhard.kaindl@....net, Thomas Gleixner <tglx@...utronix.de>,
	linux1394-devel@...ts.sourceforge.net,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Rafael Wysocki <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ebiderman@...ssion.com, hpa@...or.com
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)

On 02/04/10 01:35, Jan Beulich wrote:
>>>> "Justin P. Mattock"<justinmattock@...il.com>  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
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