linux-kernel - Re: [PATCH] drm: i915: ensure objects are allocated below 4GB on PAE

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Date:	Tue, 26 May 2009 21:17:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kyle McMartin <kyle@...artin.ca>
Cc:	airlied@...hat.com, dri-devel@...ts.sf.net,
	linux-kernel@...r.kernel.org, jbarnes@...tuousgeek.org,
	eric@...olt.net, stable@...nel.org, hugh.dickins@...cali.co.uk,
	linux-mm@...ck.org, shaohua.li@...el.com
Subject: Re: [PATCH] drm: i915: ensure objects are allocated below 4GB on
 PAE

On Tue, 2009-05-26 at 12:27 -0400, Kyle McMartin wrote:
> From: Kyle McMartin <kyle@...hat.com>
> 
> 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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