Re: "BUG: Bad page map in process Xorg" with 3.1 kernel

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From: Jurij Smakov <jurij@xxxxxxxxx>
Date: Wed, 21 Dec 2011 21:34:29 +0000

> On Wed, Dec 21, 2011 at 03:58:38PM -0500, David Miller wrote:
>> From: Jurij Smakov <jurij@xxxxxxxxx>
>> Date: Tue, 20 Dec 2011 23:00:40 +0000
>> 
>> > Today I've tried running Xorg on my SunBlade 1000 with a rather old 
>> > ATI Mach64 graphics card. When I launch Xorg, messages like these get 
>> > logged a few times:
>> 
>> Can you see if reverting this fixes things?
>> 
>> --------------------
>> commit 3e37fd3153ac95088a74f5e7c569f7567e9f993a
>> Author: David S. Miller <davem@xxxxxxxxxxxxx>
>> Date:   Thu Nov 17 18:17:59 2011 -0800
>> 
>>     sparc: Kill custom io_remap_pfn_range().
>>     
>>     To handle the large physical addresses, just make a simple wrapper
>>     around remap_pfn_range() like MIPS does.
>>     
>>     Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
> 
> It does not look like this change made it into 3.1 (where I see these 
> errors).

Interesting.... try applying it! :-)

The bug log message is essentially complaining that pte_special() is
not true and the PFN is for an area outside of the physical memory
range.

The patch I mentioned uses generic code instead of the by-hand sparc
stuff, and is likely to fix that kind of problem.

So give it a try and let me know how it goes.

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