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SubjectRe: [PATCH] drm: i915: ensure objects are allocated below 4GB on PAE
On Thu, May 28, 2009 at 01:40:12AM +0800, Eric Anholt wrote:
> On Wed, 2009-05-27 at 08:42 +0800, Shaohua Li wrote:
> > On Wed, May 27, 2009 at 08:18:40AM +0800, Kyle McMartin wrote:
> > > 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.
> > For i386, GFP_USER is enough. But 945G GART can only map to physical page < 4G,
> > so for x64, we need GFP_DMA32. This is the reason I add extra GFP_DMA32.
>
> Those 945Gs don't have memory located above 4G, from my reading of the
> chipset specs.
ok, then GFP_DMA32 can be removed from the patch.


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