[3.4.y, 3.5.y] drm/i915: Use the correct size of the GTT for placing the per-process entries

[Luis Henriques]

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.

Thanks, I'll queue this for 3.5 kernel as well.

Cheers,
--
Luis

> 
> 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).
> 
> Thoughts welcome, as always.
> 
> Regards,
> Jonathan
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