Re: [PATCH] drm: i915: ensure objects are allocated below 4GB onPAE

[Peter Zijlstra]

On Tue, 2009-05-26 at 12:27 -0400, Kyle McMartin wrote:
> From: Kyle McMartin <kyle@xxxxxxxxxx>
> 
> Ensure we allocate GEM objects below 4GB on PAE machines, otherwise
> misery ensues. This patch is based on a patch found on dri-devel by
> Shaohua Li, but Keith P. expressed reticence that the changes unfairly
> penalized other hardware.
> 
> (The mm/shmem.c hunk is necessary to ensure the DMA32 flag isn't used
>  by the slab allocator via radix_tree_preload, which will hit a
>  WARN_ON.)

Why is this, is the gart not PAE friendly?

Seems to me its a grand way of promoting 64bit hard/soft-ware.
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