bdi_unregister    810 block/genhd.c  			bdi_unregister(disk->queue->backing_dev_info);
bdi_unregister     37 include/linux/backing-dev.h void bdi_unregister(struct backing_dev_info *bdi);
bdi_unregister   1034 mm/backing-dev.c 		bdi_unregister(bdi);