The block device doesn't use percpu rw-semaphore anymore, so don't select
it for compilation.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJens Axboe <axboe@kernel.dk>