Extern or forward variable declaration at include/linux/blkdev.h, line 34 References: block/bfq-iosched.c, line 4597 block/bfq-iosched.c, line 4642 block/bfq-iosched.c, line 4803 block/bfq-iosched.c, line 4825 block/bfq-iosched.c, line 4837 block/bfq-iosched.c, line 4865 block/bfq-iosched.c, line 4881 block/bfq-iosched.c, line 4905 block/bfq-iosched.c, line 4924 block/bfq-iosched.c, line 4942 block/blk-merge.c, line 760 block/blk-mq-sched.c, line 95 block/blk-mq-sched.c, line 229 block/blk-mq-sched.c, line 361 block/blk-mq-sched.c, line 394 block/blk-mq-sched.c, line 464 block/blk-mq-sched.c, line 490 block/blk-mq-sched.c, line 508 block/blk-mq-sched.c, line 558 block/blk-mq-sched.h, line 28 block/blk-mq-sched.h, line 50 block/blk-mq-sched.h, line 60 block/blk-mq-sched.h, line 69 block/blk-mq-sched.h, line 78 block/blk-mq-sched.h, line 86 block/blk-mq.c, line 301 block/blk-mq.c, line 426 block/blk.h, line 193 block/blk.h, line 201 block/cfq-iosched.c, line 4571 block/cfq-iosched.c, line 4600 block/cfq-iosched.c, line 4697 block/cfq-iosched.c, line 4727 block/cfq-iosched.c, line 4750 block/cfq-iosched.c, line 4765 block/cfq-iosched.c, line 4799 block/deadline-iosched.c, line 321 block/deadline-iosched.c, line 337 block/deadline-iosched.c, line 386 block/deadline-iosched.c, line 402 block/elevator.c, line 61 block/elevator.c, line 157 block/elevator.c, line 160 block/elevator.c, line 178 block/elevator.c, line 180 block/elevator.c, line 256 block/elevator.c, line 284 block/elevator.c, line 300 block/elevator.c, line 437 block/elevator.c, line 525 block/elevator.c, line 541 block/elevator.c, line 565 block/elevator.c, line 616 block/elevator.c, line 727 block/elevator.c, line 739 block/elevator.c, line 751 block/elevator.c, line 763 block/elevator.c, line 774 block/elevator.c, line 787 block/elevator.c, line 809 block/elevator.c, line 815 block/elevator.c, line 827 block/elevator.c, line 833 block/elevator.c, line 852 block/elevator.c, line 877 block/elevator.c, line 992 block/elevator.c, line 1112 block/kyber-iosched.c, line 341 block/kyber-iosched.c, line 361 block/kyber-iosched.c, line 648 block/kyber-iosched.c, line 656 block/mq-deadline.c, line 303 block/mq-deadline.c, line 319 block/mq-deadline.c, line 470 block/mq-deadline.c, line 486 block/noop-iosched.c, line 65 block/noop-iosched.c, line 86 include/linux/blkdev.h, line 34 include/linux/blkdev.h, line 392