drm/omap: use __GFP_DMA32 for shmem-backed gem
authorDavid Herrmann <dh.herrmann@gmail.com>
Sun, 25 May 2014 10:45:39 +0000 (12:45 +0200)
committerDavid Herrmann <dh.herrmann@gmail.com>
Mon, 7 Jul 2014 22:29:16 +0000 (00:29 +0200)
commitab5a60c3ee41ff22304e2bcf63c151aa2851df0c
treefcdfe459bbbd820c7f46df819f179b29d91e3c2c
parent4661270797f0c172da4b54415574421cd27f1bf3
drm/omap: use __GFP_DMA32 for shmem-backed gem

OMAP requires bo-pages to be in the DMA32 zone. Explicitly request this by
setting __GFP_DMA32 as mapping-gfp-mask during shmem initialization. This
drops HIGHMEM from the gfp-mask and uses DMA32 instead. shmem-core takes
care to relocate pages during swap-in in case they have been loaded into
the wrong zone.

It is _not_ possible to pass __GFP_DMA32 to shmem_read_mapping_page_gfp()
as the page might have already been swapped-in at that time. The zone-mask
must be set during initialization and be kept constant for now.

Remove the now superfluous TODO in omap_gem.c.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
drivers/gpu/drm/omapdrm/omap_gem.c