BLK_MQ_F_ALLOC_POLICY_BITS  244 include/linux/blk-mq.h 		((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
BLK_MQ_F_ALLOC_POLICY_BITS  246 include/linux/blk-mq.h 	((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \