block/rq_qos: add rq_qos_merge()
Add a merge hook for rq_qos. This will be used by io.weight. Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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Add a merge hook for rq_qos. This will be used by io.weight. Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>