block: don't select PERCPU_RWSEM
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>
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