From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Fri, 24 Jul 2009 07:57:34 +0000 (+0200)
Subject: drm/ttm: Fix ttm in-kernel copying of pages with non-standard caching attributes.
X-Git-Tag: v2.6.31-rc5~66^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=542c6f6df51327dbb180cf4d9b34827e147efe17;p=pandora-kernel.git

drm/ttm: Fix ttm in-kernel copying of pages with non-standard caching attributes.

For x86 this affected highmem pages only, since they were always kmapped
cache-coherent, and this is fixed using kmap_atomic_prot().

For other architectures that may not modify the linear kernel map we
resort to vmap() for now, since kmap_atomic_prot() generally uses the
linear kernel map for lowmem pages. This of course comes with a
performance impact and should be optimized when possible.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

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