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drm: Use pgprot_writecombine in GEM GTT mapping to get the right bits for !PAT.
authorJesse Barnes <jbarnes@virtuousgeek.org>
Wed, 1 Apr 2009 01:22:31 +0000 (18:22 -0700)
committerEric Anholt <eric@anholt.net>
Thu, 2 Apr 2009 21:28:32 +0000 (14:28 -0700)
Otherwise, the PAGE_CACHE_WC would end up getting us a UC-only mapping, and
the write performance of GTT maps dropped 10x.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[anholt: cleaned up unused var]
Signed-off-by: Eric Anholt <eric@anholt.net>

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