From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <gregkh@linuxfoundation.org>
Subject: Re: [3.4.y, 3.5.y] drm/i915: Use the correct size of the GTT for
 placing the per-process entries
Date: Fri, 12 Apr 2013 13:00:26 -0700
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To: Jonathan Nieder <jrnieder@gmail.com>
Cc: stable@vger.kernel.org, Geoff Crompton <geoffc@trinity.unimelb.edu.au>, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Matthew Garrett <mjg@redhat.com>, Chris Wilson <chris@chris-wilson.co.uk>, Ben Widawsky <ben@bwidawsk.net>, Daniel Vetter <daniel.vetter@ffwll.ch>
List-Id: dri-devel@lists.freedesktop.org

On Fri, Apr 12, 2013 at 12:31:53AM -0700, Jonathan Nieder wrote:
> Hi Greg,
> 
> Please consider
> 
>  9a0f938bde74 drm/i915: Use the correct size of the GTT for placing
>               the per-process entries, 2012-08-24
> 
> for application to the 3.4.y tree.
> 
> Without this patch, Geoff Crompton's iMac hits a BUG during bootup.
> The problem is reproducible on
> 
>  * Debian's 3.2.y-based kernel with drm backported from 3.4.37
>  * a Debian kernel close to 3.4.4
>  * a Debian kernel close to 3.5.5
>  * vanilla 3.4.4
> 
> He is not able to reproduce the problem on
> 
>  * Debian's older 3.2.y-based kernels without the 3.4.y drm backport
>  * a Debian kernel close to 3.6.4; various newer kernels
>  * vanilla 3.4.4 + this patch
> 
> The patch was applied upstream during the 3.6-rc4 cycle, so newer
> kernels don't need it.
> 
> http://bugs.debian.org/703468 has details, including a screenshot of
> the boot failure ("unable to handling kernel paging request at
> ffffc9000b7ff000" in i915_gem_init_ppgtt).

Now applied, thanks.

greg k-h