tree: git://git.infradead.org/users/hch/block.git block-bounce-cleanup head: 6b1b8e36f63fe989298a53f04961018c1785f0b3 commit: 6b1b8e36f63fe989298a53f04961018c1785f0b3 [6/6] block: only build the block layer bounce buffering if drivers need it config: x86_64-randconfig-c022-20210311 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): git remote add hch-block git://git.infradead.org/users/hch/block.git git fetch --no-tags hch-block block-bounce-cleanup git checkout 6b1b8e36f63fe989298a53f04961018c1785f0b3 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: block/blk-mq.o: in function `blk_queue_bounce': block/blk.h:332: undefined reference to `__blk_queue_bounce' ld: drivers/block/floppy.o: in function `floppy_alloc_disk': ld: drivers/scsi/scsi_lib.o: in function `__scsi_init_queue': vim +4600 drivers/block/floppy.c 8d3ab4ebfd7435 Herton Ronaldo Krzesinski 2012-08-27 4582 302cfee150291c Christoph Hellwig 2020-10-29 4583 static int floppy_alloc_disk(unsigned int drive, unsigned int type) ^1da177e4c3f41 Linus Torvalds 2005-04-16 4584 { 302cfee150291c Christoph Hellwig 2020-10-29 4585 struct gendisk *disk; 302cfee150291c Christoph Hellwig 2020-10-29 4586 int err; 302cfee150291c Christoph Hellwig 2020-10-29 4587 302cfee150291c Christoph Hellwig 2020-10-29 4588 disk = alloc_disk(1); 302cfee150291c Christoph Hellwig 2020-10-29 4589 if (!disk) 302cfee150291c Christoph Hellwig 2020-10-29 4590 return -ENOMEM; 302cfee150291c Christoph Hellwig 2020-10-29 4591 302cfee150291c Christoph Hellwig 2020-10-29 4592 disk->queue = blk_mq_init_queue(&tag_sets[drive]); 302cfee150291c Christoph Hellwig 2020-10-29 4593 if (IS_ERR(disk->queue)) { 302cfee150291c Christoph Hellwig 2020-10-29 4594 err = PTR_ERR(disk->queue); 302cfee150291c Christoph Hellwig 2020-10-29 4595 disk->queue = NULL; 302cfee150291c Christoph Hellwig 2020-10-29 4596 put_disk(disk); 302cfee150291c Christoph Hellwig 2020-10-29 4597 return err; 302cfee150291c Christoph Hellwig 2020-10-29 4598 } 302cfee150291c Christoph Hellwig 2020-10-29 4599 302cfee150291c Christoph Hellwig 2020-10-29 @4600 blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH); 302cfee150291c Christoph Hellwig 2020-10-29 4601 blk_queue_max_hw_sectors(disk->queue, 64); 302cfee150291c Christoph Hellwig 2020-10-29 4602 disk->major = FLOPPY_MAJOR; 302cfee150291c Christoph Hellwig 2020-10-29 4603 disk->first_minor = TOMINOR(drive) | (type << 2); 302cfee150291c Christoph Hellwig 2020-10-29 4604 disk->fops = &floppy_fops; 302cfee150291c Christoph Hellwig 2020-10-29 4605 disk->events = DISK_EVENT_MEDIA_CHANGE; 302cfee150291c Christoph Hellwig 2020-10-29 4606 if (type) 302cfee150291c Christoph Hellwig 2020-10-29 4607 sprintf(disk->disk_name, "fd%d_type%d", drive, type); 302cfee150291c Christoph Hellwig 2020-10-29 4608 else 302cfee150291c Christoph Hellwig 2020-10-29 4609 sprintf(disk->disk_name, "fd%d", drive); 302cfee150291c Christoph Hellwig 2020-10-29 4610 /* to be cleaned up... */ 302cfee150291c Christoph Hellwig 2020-10-29 4611 disk->private_data = (void *)(long)drive; 302cfee150291c Christoph Hellwig 2020-10-29 4612 disk->flags |= GENHD_FL_REMOVABLE; 302cfee150291c Christoph Hellwig 2020-10-29 4613 302cfee150291c Christoph Hellwig 2020-10-29 4614 disks[drive][type] = disk; 302cfee150291c Christoph Hellwig 2020-10-29 4615 return 0; 302cfee150291c Christoph Hellwig 2020-10-29 4616 } 302cfee150291c Christoph Hellwig 2020-10-29 4617 :::::: The code at line 4600 was first introduced by commit :::::: 302cfee150291c6cd85b1ca197d062d0b423d09c floppy: use a separate gendisk for each media format :::::: TO: Christoph Hellwig <hch(a)lst.de&gt; :::::: CC: Jens Axboe <axboe(a)kernel.dk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org