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Conversion to the use of pinned pfns made some functions unused. Remove them. Also there's no need to lock mmap_sem in __buf_prepare() anymore. Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>