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    SubjectRe: [PATCH] drm: i915: ensure objects are allocated below 4GB on PAE
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    On Tue, 2009-05-26 at 14:35 -0700, Eric Anholt wrote:
    > On Tue, 2009-05-26 at 21:17 +0200, Peter Zijlstra wrote:
    > > On Tue, 2009-05-26 at 12:27 -0400, Kyle McMartin wrote:
    > > > From: Kyle McMartin <kyle@redhat.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.
    >
    > No, the GART's fine. But the APIs required to make the AGP code
    > PAE-friendly got deprecated, so the patches to fix the AGP code got
    > NAKed, and Venkatesh never sent out his patches to undeprecate the APIs
    > and use them.
    >
    > It's been like 6 months now, and it's absurd. I'd like to see this
    > patch go in so people's graphics can start working again and stop
    > corrupting system memory.

    For .30 yes, for .31 we need to resolve that AGP issue, 6 months does
    seem excessive to get something like that sorted.



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