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48cc661e7f
If null_blk is run in NULL_IRQ_TIMER mode and with queue_mode NULL_Q_RQ, we need to restart the queue from the hrtimer interrupt. We can't directly invoke the request_fn from that context, so punt the queue run to async kblockd context. Tested-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jens Axboe <axboe@fb.com>