parisc: Flush gatt writes and adjust gatt mask in parisc_agp_mask_memory()
[ Upstream commit d7037973 ] Flush caches after changing gatt entries and calculate entry according to SBA requirements. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
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