Alexey Brodkin e5e0a65cd2
arc: Add our own implementation of fb_pgprotect() ...
During mmaping of frame-buffer pages to user-space
fb_protect() is called to set proper page settings.
In case of ARC we need to mark pages that are mmaped to
user as uncached because of 2 reasons:
* Huge amount of data if passing through data cache will
thrash cache a lot making cache almost useless for other
less traffic hungry processes.
* Data written by user in FB will be immediately available for
hardware (such as PGU etc) without requirements to flush data
cache regularly.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com >
Cc: linux-snps-arc@lists.infradead.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com >
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