drm/ttm: fix uncached page deallocation to properly fill page pool v3.
Current code never allowed the page pool to actualy fill in anyway. This fix it, so that we only start freeing page from the pool when we go over the pool size. Changed since v1: - Move the page batching optimization to its separate patch. Changed since v2: - Do not remove code part of the batching optimization with this patch. - Better commit message. Signed-off-by: NJérôme Glisse <jglisse@redhat.com> Reviewed-by: NMario Kleiner <mario.kleiner.de@gmail.com> Reviewed-and-Tested-by: NMichel Dänzer <michel.daenzer@amd.com> Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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