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

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Date:	Tue, 26 May 2009 20:18:40 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
Cc:	Kyle McMartin <kyle@...artin.ca>, airlied@...hat.com,
	dri-devel@...ts.sf.net, linux-kernel@...r.kernel.org,
	jbarnes@...tuousgeek.org, eric@...olt.net, stable@...nel.org,
	linux-mm@...ck.org, shaohua.li@...el.com
Subject: Re: [PATCH] drm: i915: ensure objects are allocated below 4GB on
	PAE

On Tue, May 26, 2009 at 11:55:50PM +0100, Hugh Dickins wrote:
> I'm confused: I thought GFP_DMA32 only applies on x86_64:
> my 32-bit PAE machine with (slightly!) > 4GB shows no ZONE_DMA32.
> Does this patch perhaps depend on another, to enable DMA32 on 32-bit
> PAE, or am I just in a muddle?
> 

No, you're exactly right, I'm just a muppet and missed the obvious.
Looks like the "correct" fix is the fact that the allocation is thus
filled out with GFP_USER, therefore, from ZONE_NORMAL, and below
max_low_pfn.

Looks like we'll need some additional thinking to get true ZONE_DMA32 on
i386... ugh, I'll look into it tonight.

regards, Kyle

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