[kbuild-all] [mcgrof:20210816-add-disk-error-handling 64/64] drivers/nvdimm/pmem.c:495:2: warning: ignoring return value of 'device_add_disk', declared with attribute warn_unused_result

tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git 20210816-add-disk-error-handling head: e1e79332ea1bba0e751529b114ef9d301bf962a5 commit: e1e79332ea1bba0e751529b114ef9d301bf962a5 [64/64] block: add __must_check for *add_disk*() callers config: x86_64-randconfig-a003-20210816 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/commit/?... git remote add mcgrof https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git git fetch --no-tags mcgrof 20210816-add-disk-error-handling git checkout e1e79332ea1bba0e751529b114ef9d301bf962a5 # 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 warnings (new ones prefixed by >>): drivers/nvdimm/pmem.c: In function 'pmem_attach_disk': 495 | device_add_disk(dev, disk, NULL); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/device_add_disk +495 drivers/nvdimm/pmem.c 1e240e8d4a7d92 drivers/nvdimm/pmem.c Christoph Hellwig 2019-06-26 369 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 370 static int pmem_attach_disk(struct device *dev, 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 371 struct nd_namespace_common *ndns) 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 372 { 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 373 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); f284a4f23752d0 drivers/nvdimm/pmem.c Dan Williams 2016-07-07 374 struct nd_region *nd_region = to_nd_region(dev->parent); ce7f11a230d5b7 drivers/nvdimm/pmem.c Ross Zwisler 2018-06-06 375 int nid = dev_to_node(dev), fua; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 376 struct resource *res = &nsio->res; a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 377 struct range bb_range; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 378 struct nd_pfn *nd_pfn = NULL; c1d6e828a35df5 drivers/nvdimm/pmem.c Dan Williams 2017-01-24 379 struct dax_device *dax_dev; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 380 struct nd_pfn_sb *pfn_sb; 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 381 struct pmem_device *pmem; 468ded03c07e0f drivers/nvdimm/pmem.c Dan Williams 2016-01-15 382 struct request_queue *q; 6e0c90d691cd5d drivers/nvdimm/pmem.c Dan Williams 2017-06-26 383 struct device *gendev; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 384 struct gendisk *disk; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 385 void *addr; e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 386 int rc; fefc1d97fa4b5e drivers/nvdimm/pmem.c Pankaj Gupta 2019-07-05 387 unsigned long flags = 0UL; e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 388 e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 389 pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 390 if (!pmem) e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 391 return -ENOMEM; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 392 8f4b01fcded2dc drivers/nvdimm/pmem.c Aneesh Kumar K.V 2019-10-31 393 rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); 8f4b01fcded2dc drivers/nvdimm/pmem.c Aneesh Kumar K.V 2019-10-31 394 if (rc) 8f4b01fcded2dc drivers/nvdimm/pmem.c Aneesh Kumar K.V 2019-10-31 395 return rc; 8f4b01fcded2dc drivers/nvdimm/pmem.c Aneesh Kumar K.V 2019-10-31 396 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 397 /* while nsio_rw_bytes is active, parse a pfn info block if present */ 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 398 if (is_nd_pfn(dev)) { 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 399 nd_pfn = to_nd_pfn(dev); e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 400 rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap); e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 401 if (rc) e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 402 return rc; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 403 } 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 404 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 405 /* we're attaching a block device, disable raw namespace access */ 8f4b01fcded2dc drivers/nvdimm/pmem.c Aneesh Kumar K.V 2019-10-31 406 devm_namespace_disable(dev, ndns); 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 407 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 408 dev_set_drvdata(dev, pmem); 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 409 pmem->phys_addr = res->start; 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 410 pmem->size = resource_size(res); 0b277961f4484f drivers/nvdimm/pmem.c Dan Williams 2017-06-09 411 fua = nvdimm_has_flush(nd_region); 0b277961f4484f drivers/nvdimm/pmem.c Dan Williams 2017-06-09 412 if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) { 61031952f4c89d drivers/nvdimm/pmem.c Ross Zwisler 2015-06-25 413 dev_warn(dev, "unable to guarantee persistence of writes\n"); 0b277961f4484f drivers/nvdimm/pmem.c Dan Williams 2017-06-09 414 fua = 0; 0b277961f4484f drivers/nvdimm/pmem.c Dan Williams 2017-06-09 415 } 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 416 947df02d255a6a drivers/nvdimm/pmem.c Dan Williams 2016-03-21 417 if (!devm_request_mem_region(dev, res->start, resource_size(res), 450c6633e874c4 drivers/nvdimm/pmem.c Dan Williams 2016-11-28 418 dev_name(&ndns->dev))) { 947df02d255a6a drivers/nvdimm/pmem.c Dan Williams 2016-03-21 419 dev_warn(dev, "could not reserve region %pR\n", res); 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 420 return -EBUSY; 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 421 } 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 422 87eb73b2ca7c1b drivers/nvdimm/pmem.c Christoph Hellwig 2021-05-21 423 disk = blk_alloc_disk(nid); 87eb73b2ca7c1b drivers/nvdimm/pmem.c Christoph Hellwig 2021-05-21 424 if (!disk) 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 425 return -ENOMEM; 87eb73b2ca7c1b drivers/nvdimm/pmem.c Christoph Hellwig 2021-05-21 426 q = disk->queue; 468ded03c07e0f drivers/nvdimm/pmem.c Dan Williams 2016-01-15 427 87eb73b2ca7c1b drivers/nvdimm/pmem.c Christoph Hellwig 2021-05-21 428 pmem->disk = disk; a624eb520390ce drivers/nvdimm/pmem.c Dan Williams 2021-06-07 429 pmem->pgmap.owner = pmem; 34c0fd540e79fb drivers/nvdimm/pmem.c Dan Williams 2016-01-15 430 pmem->pfn_flags = PFN_DEV; e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 431 pmem->pgmap.ref = &q->q_usage_counter; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 432 if (is_nd_pfn(dev)) { f6a55e1a3fe6b3 drivers/nvdimm/pmem.c Christoph Hellwig 2019-06-26 433 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; f6a55e1a3fe6b3 drivers/nvdimm/pmem.c Christoph Hellwig 2019-06-26 434 pmem->pgmap.ops = &fsdax_pagemap_ops; e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 435 addr = devm_memremap_pages(dev, &pmem->pgmap); 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 436 pfn_sb = nd_pfn->pfn_sb; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 437 pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 438 pmem->pfn_pad = resource_size(res) - a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 439 range_len(&pmem->pgmap.range); 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 440 pmem->pfn_flags |= PFN_MAP; a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 441 bb_range = pmem->pgmap.range; a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 442 bb_range.start += pmem->data_offset; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 443 } else if (pmem_should_map_pages(dev)) { a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 444 pmem->pgmap.range.start = res->start; a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 445 pmem->pgmap.range.end = res->end; b7b3c01b191596 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 446 pmem->pgmap.nr_range = 1; f6a55e1a3fe6b3 drivers/nvdimm/pmem.c Christoph Hellwig 2019-06-26 447 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; f6a55e1a3fe6b3 drivers/nvdimm/pmem.c Christoph Hellwig 2019-06-26 448 pmem->pgmap.ops = &fsdax_pagemap_ops; e8d5134833006a drivers/nvdimm/pmem.c Christoph Hellwig 2017-12-29 449 addr = devm_memremap_pages(dev, &pmem->pgmap); 34c0fd540e79fb drivers/nvdimm/pmem.c Dan Williams 2016-01-15 450 pmem->pfn_flags |= PFN_MAP; a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 451 bb_range = pmem->pgmap.range; 91ed7ac444ef74 drivers/nvdimm/pmem.c Dan Williams 2018-10-04 452 } else { 50f44ee7248ad2 drivers/nvdimm/pmem.c Dan Williams 2019-06-13 453 if (devm_add_action_or_reset(dev, pmem_release_queue, d8668bb0451c3c drivers/nvdimm/pmem.c Christoph Hellwig 2019-06-26 454 &pmem->pgmap)) 50f44ee7248ad2 drivers/nvdimm/pmem.c Dan Williams 2019-06-13 455 return -ENOMEM; 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 456 addr = devm_memremap(dev, pmem->phys_addr, 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 457 pmem->size, ARCH_MEMREMAP_PMEM); a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 458 bb_range.start = res->start; a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 459 bb_range.end = res->end; 91ed7ac444ef74 drivers/nvdimm/pmem.c Dan Williams 2018-10-04 460 } b36f47617f6ce7 drivers/nvdimm/pmem.c Dan Williams 2015-09-15 461 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 462 if (IS_ERR(addr)) 200c79da824c97 drivers/nvdimm/pmem.c Dan Williams 2016-03-22 463 return PTR_ERR(addr); 7a9eb206663177 drivers/nvdimm/pmem.c Dan Williams 2016-06-03 464 pmem->virt_addr = addr; 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 465 ce7f11a230d5b7 drivers/nvdimm/pmem.c Ross Zwisler 2018-06-06 466 blk_queue_write_cache(q, true, fua); 5a92289f41311a drivers/nvdimm/pmem.c Dan Williams 2016-03-21 467 blk_queue_physical_block_size(q, PAGE_SIZE); f979b13c3cc515 drivers/nvdimm/pmem.c Dan Williams 2017-06-04 468 blk_queue_logical_block_size(q, pmem_sector_size(ndns)); 5a92289f41311a drivers/nvdimm/pmem.c Dan Williams 2016-03-21 469 blk_queue_max_hw_sectors(q, UINT_MAX); 8b904b5b6b58b9 drivers/nvdimm/pmem.c Bart Van Assche 2018-03-07 470 blk_queue_flag_set(QUEUE_FLAG_NONROT, q); 4557641b4c7046 drivers/nvdimm/pmem.c Ross Zwisler 2018-06-26 471 if (pmem->pfn_flags & PFN_MAP) 8b904b5b6b58b9 drivers/nvdimm/pmem.c Bart Van Assche 2018-03-07 472 blk_queue_flag_set(QUEUE_FLAG_DAX, q); 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 473 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 474 disk->fops = &pmem_fops; 6ec26b8b2d70b4 drivers/nvdimm/pmem.c Christoph Hellwig 2020-05-08 475 disk->private_data = pmem; 5212e11fde4d40 drivers/nvdimm/pmem.c Vishal Verma 2015-06-25 476 nvdimm_namespace_disk_name(ndns, disk->disk_name); cfe30b872058f2 drivers/nvdimm/pmem.c Dan Williams 2016-03-03 477 set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) cfe30b872058f2 drivers/nvdimm/pmem.c Dan Williams 2016-03-03 478 / 512); b95f5f4391fad6 drivers/nvdimm/pmem.c Dan Williams 2016-01-04 479 if (devm_init_badblocks(dev, &pmem->bb)) b95f5f4391fad6 drivers/nvdimm/pmem.c Dan Williams 2016-01-04 480 return -ENOMEM; a4574f63edc6f7 drivers/nvdimm/pmem.c Dan Williams 2020-10-13 481 nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range); 57f7f317abdd07 drivers/nvdimm/pmem.c Dan Williams 2016-01-06 482 disk->bb = &pmem->bb; f02716db951c5e drivers/nvdimm/pmem.c Dan Williams 2016-06-15 483 fefc1d97fa4b5e drivers/nvdimm/pmem.c Pankaj Gupta 2019-07-05 484 if (is_nvdimm_sync(nd_region)) fefc1d97fa4b5e drivers/nvdimm/pmem.c Pankaj Gupta 2019-07-05 485 flags = DAXDEV_F_SYNC; fefc1d97fa4b5e drivers/nvdimm/pmem.c Pankaj Gupta 2019-07-05 486 dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags); 4e4ced93794acb drivers/nvdimm/pmem.c Vivek Goyal 2020-04-01 487 if (IS_ERR(dax_dev)) { 4e4ced93794acb drivers/nvdimm/pmem.c Vivek Goyal 2020-04-01 488 return PTR_ERR(dax_dev); c1d6e828a35df5 drivers/nvdimm/pmem.c Dan Williams 2017-01-24 489 } ce7f11a230d5b7 drivers/nvdimm/pmem.c Ross Zwisler 2018-06-06 490 dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); c1d6e828a35df5 drivers/nvdimm/pmem.c Dan Williams 2017-01-24 491 pmem->dax_dev = dax_dev; 6e0c90d691cd5d drivers/nvdimm/pmem.c Dan Williams 2017-06-26 492 gendev = disk_to_dev(disk); 6e0c90d691cd5d drivers/nvdimm/pmem.c Dan Williams 2017-06-26 493 gendev->groups = pmem_attribute_groups; 6e0c90d691cd5d drivers/nvdimm/pmem.c Dan Williams 2017-06-26 494 fef912bf860e8e drivers/nvdimm/pmem.c Hannes Reinecke 2018-09-28 @495 device_add_disk(dev, disk, NULL); c1d6e828a35df5 drivers/nvdimm/pmem.c Dan Williams 2017-01-24 496 if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) f02716db951c5e drivers/nvdimm/pmem.c Dan Williams 2016-06-15 497 return -ENOMEM; f02716db951c5e drivers/nvdimm/pmem.c Dan Williams 2016-06-15 498 32f61d67570db0 drivers/nvdimm/pmem.c Christoph Hellwig 2020-09-01 499 nvdimm_check_and_set_ro(disk); 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 500 975750a98c2676 drivers/nvdimm/pmem.c Toshi Kani 2017-06-12 501 pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd, 975750a98c2676 drivers/nvdimm/pmem.c Toshi Kani 2017-06-12 502 "badblocks"); 6aa734a2f38e2e drivers/nvdimm/pmem.c Dan Williams 2017-06-30 503 if (!pmem->bb_state) 6aa734a2f38e2e drivers/nvdimm/pmem.c Dan Williams 2017-06-30 504 dev_warn(dev, "'badblocks' notification disabled\n"); 975750a98c2676 drivers/nvdimm/pmem.c Toshi Kani 2017-06-12 505 8c2f7e8658df1d drivers/nvdimm/pmem.c Dan Williams 2015-06-25 506 return 0; 8c2f7e8658df1d drivers/nvdimm/pmem.c Dan Williams 2015-06-25 507 } 9e853f2313e5eb drivers/block/pmem.c Ross Zwisler 2015-04-01 508 :::::: The code at line 495 was first introduced by commit :::::: fef912bf860e8e7e48a2bfb978a356bba743a8b7 block: genhd: add 'groups' argument to device_add_disk :::::: TO: Hannes Reinecke <hare(a)suse.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