tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git 20210818-add-disk-error-handling-v2 head: 0517c8bf82eb7da58caada94869afb0957f57c81 commit: 0517c8bf82eb7da58caada94869afb0957f57c81 [160/160] block: add __must_check for *add_disk*() callers config: hexagon-randconfig-r015-20210818 (attached as .config) compiler: clang version 12.0.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # 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 20210818-add-disk-error-handling-v2 git checkout 0517c8bf82eb7da58caada94869afb0957f57c81 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon 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 >>): add_disk(tdisk); ^~~~~~~~ ~~~~~ 1 warning generated. vim +/warn_unused_result +400 drivers/lightnvm/core.c e53927393b9987 Javier González 2018-01-05 304 ade69e2432b795 Matias Bjørling 2017-01-31 305 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) ade69e2432b795 Matias Bjørling 2017-01-31 306 { e53927393b9987 Javier González 2018-01-05 307 struct nvm_ioctl_create_extended e; ade69e2432b795 Matias Bjørling 2017-01-31 308 struct gendisk *tdisk; ade69e2432b795 Matias Bjørling 2017-01-31 309 struct nvm_tgt_type *tt; ade69e2432b795 Matias Bjørling 2017-01-31 310 struct nvm_target *t; ade69e2432b795 Matias Bjørling 2017-01-31 311 struct nvm_tgt_dev *tgt_dev; ade69e2432b795 Matias Bjørling 2017-01-31 312 void *targetdata; a14669ebc0e294 Igor Konopko 2019-05-04 313 unsigned int mdts; 8d77bb8276062f Rakesh Pandit 2017-04-20 314 int ret; ade69e2432b795 Matias Bjørling 2017-01-31 315 e53927393b9987 Javier González 2018-01-05 316 switch (create->conf.type) { e53927393b9987 Javier González 2018-01-05 317 case NVM_CONFIG_TYPE_SIMPLE: e53927393b9987 Javier González 2018-01-05 318 ret = __nvm_config_simple(dev, &create->conf.s); e53927393b9987 Javier González 2018-01-05 319 if (ret) e53927393b9987 Javier González 2018-01-05 320 return ret; e53927393b9987 Javier González 2018-01-05 321 e53927393b9987 Javier González 2018-01-05 322 e.lun_begin = create->conf.s.lun_begin; e53927393b9987 Javier González 2018-01-05 323 e.lun_end = create->conf.s.lun_end; e53927393b9987 Javier González 2018-01-05 324 e.op = NVM_TARGET_DEFAULT_OP; e53927393b9987 Javier González 2018-01-05 325 break; e53927393b9987 Javier González 2018-01-05 326 case NVM_CONFIG_TYPE_EXTENDED: e53927393b9987 Javier González 2018-01-05 327 ret = __nvm_config_extended(dev, &create->conf.e); e53927393b9987 Javier González 2018-01-05 328 if (ret) e53927393b9987 Javier González 2018-01-05 329 return ret; e53927393b9987 Javier González 2018-01-05 330 e53927393b9987 Javier González 2018-01-05 331 e = create->conf.e; e53927393b9987 Javier González 2018-01-05 332 break; e53927393b9987 Javier González 2018-01-05 333 default: 43db059ea4b7e9 Minwoo Im 2019-09-05 334 pr_err("config type not valid\n"); e53927393b9987 Javier González 2018-01-05 335 return -EINVAL; e53927393b9987 Javier González 2018-01-05 336 } e53927393b9987 Javier González 2018-01-05 337 e29c80e6dd70d6 Javier González 2018-01-05 338 tt = nvm_find_target_type(create->tgttype); ade69e2432b795 Matias Bjørling 2017-01-31 339 if (!tt) { 43db059ea4b7e9 Minwoo Im 2019-09-05 340 pr_err("target type %s not found\n", create->tgttype); ade69e2432b795 Matias Bjørling 2017-01-31 341 return -EINVAL; ade69e2432b795 Matias Bjørling 2017-01-31 342 } ade69e2432b795 Matias Bjørling 2017-01-31 343 656e33ca3d4051 Matias Bjørling 2018-10-09 344 if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) { 43db059ea4b7e9 Minwoo Im 2019-09-05 345 pr_err("device is incompatible with target L2P type.\n"); 656e33ca3d4051 Matias Bjørling 2018-10-09 346 return -EINVAL; 656e33ca3d4051 Matias Bjørling 2018-10-09 347 } 656e33ca3d4051 Matias Bjørling 2018-10-09 348 bd77b23b40370f Javier González 2018-01-05 349 if (nvm_target_exists(create->tgtname)) { 43db059ea4b7e9 Minwoo Im 2019-09-05 350 pr_err("target name already exists (%s)\n", bd77b23b40370f Javier González 2018-01-05 351 create->tgtname); ade69e2432b795 Matias Bjørling 2017-01-31 352 return -EINVAL; ade69e2432b795 Matias Bjørling 2017-01-31 353 } ade69e2432b795 Matias Bjørling 2017-01-31 354 e53927393b9987 Javier González 2018-01-05 355 ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end); 12e9a6d62236da Rakesh Pandit 2017-06-27 356 if (ret) 12e9a6d62236da Rakesh Pandit 2017-06-27 357 return ret; ade69e2432b795 Matias Bjørling 2017-01-31 358 ade69e2432b795 Matias Bjørling 2017-01-31 359 t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); 8d77bb8276062f Rakesh Pandit 2017-04-20 360 if (!t) { 8d77bb8276062f Rakesh Pandit 2017-04-20 361 ret = -ENOMEM; ade69e2432b795 Matias Bjørling 2017-01-31 362 goto err_reserve; 8d77bb8276062f Rakesh Pandit 2017-04-20 363 } ade69e2432b795 Matias Bjørling 2017-01-31 364 e53927393b9987 Javier González 2018-01-05 365 tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op); ade69e2432b795 Matias Bjørling 2017-01-31 366 if (!tgt_dev) { 43db059ea4b7e9 Minwoo Im 2019-09-05 367 pr_err("could not create target device\n"); 8d77bb8276062f Rakesh Pandit 2017-04-20 368 ret = -ENOMEM; ade69e2432b795 Matias Bjørling 2017-01-31 369 goto err_t; ade69e2432b795 Matias Bjørling 2017-01-31 370 } ade69e2432b795 Matias Bjørling 2017-01-31 371 1aabd53a4b49ad Christoph Hellwig 2021-05-21 372 tdisk = blk_alloc_disk(dev->q->node); 8d77bb8276062f Rakesh Pandit 2017-04-20 373 if (!tdisk) { 8d77bb8276062f Rakesh Pandit 2017-04-20 374 ret = -ENOMEM; 7d1ef2f408abec Javier González 2017-04-15 375 goto err_dev; 8d77bb8276062f Rakesh Pandit 2017-04-20 376 } 7d1ef2f408abec Javier González 2017-04-15 377 6eb082452df121 Javier González 2017-04-15 378 strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name)); ade69e2432b795 Matias Bjørling 2017-01-31 379 tdisk->major = 0; ade69e2432b795 Matias Bjørling 2017-01-31 380 tdisk->first_minor = 0; c62b37d96b6eb3 Christoph Hellwig 2020-07-01 381 tdisk->fops = tt->bops; ade69e2432b795 Matias Bjørling 2017-01-31 382 4af3f75d7992dd Javier González 2017-04-15 383 targetdata = tt->init(tgt_dev, tdisk, create->flags); 8d77bb8276062f Rakesh Pandit 2017-04-20 384 if (IS_ERR(targetdata)) { 8d77bb8276062f Rakesh Pandit 2017-04-20 385 ret = PTR_ERR(targetdata); ade69e2432b795 Matias Bjørling 2017-01-31 386 goto err_init; 8d77bb8276062f Rakesh Pandit 2017-04-20 387 } ade69e2432b795 Matias Bjørling 2017-01-31 388 ade69e2432b795 Matias Bjørling 2017-01-31 389 tdisk->private_data = targetdata; 1aabd53a4b49ad Christoph Hellwig 2021-05-21 390 tdisk->queue->queuedata = targetdata; ade69e2432b795 Matias Bjørling 2017-01-31 391 a14669ebc0e294 Igor Konopko 2019-05-04 392 mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA; a14669ebc0e294 Igor Konopko 2019-05-04 393 if (dev->geo.mdts) { a14669ebc0e294 Igor Konopko 2019-05-04 394 mdts = min_t(u32, dev->geo.mdts, e46f4e4822bdec Javier González 2018-03-30 395 (dev->geo.csecs >> 9) * NVM_MAX_VLBA); a14669ebc0e294 Igor Konopko 2019-05-04 396 } 1aabd53a4b49ad Christoph Hellwig 2021-05-21 397 blk_queue_max_hw_sectors(tdisk->queue, mdts); ade69e2432b795 Matias Bjørling 2017-01-31 398 ade69e2432b795 Matias Bjørling 2017-01-31 399 set_capacity(tdisk, tt->capacity(targetdata)); ade69e2432b795 Matias Bjørling 2017-01-31 @400 add_disk(tdisk); ade69e2432b795 Matias Bjørling 2017-01-31 401 8d77bb8276062f Rakesh Pandit 2017-04-20 402 if (tt->sysfs_init && tt->sysfs_init(tdisk)) { 8d77bb8276062f Rakesh Pandit 2017-04-20 403 ret = -ENOMEM; 9a69b0ed6257ae Javier González 2017-01-31 404 goto err_sysfs; 8d77bb8276062f Rakesh Pandit 2017-04-20 405 } 9a69b0ed6257ae Javier González 2017-01-31 406 ade69e2432b795 Matias Bjørling 2017-01-31 407 t->type = tt; ade69e2432b795 Matias Bjørling 2017-01-31 408 t->disk = tdisk; ade69e2432b795 Matias Bjørling 2017-01-31 409 t->dev = tgt_dev; ade69e2432b795 Matias Bjørling 2017-01-31 410 ade69e2432b795 Matias Bjørling 2017-01-31 411 mutex_lock(&dev->mlock); ade69e2432b795 Matias Bjørling 2017-01-31 412 list_add_tail(&t->list, &dev->targets); ade69e2432b795 Matias Bjørling 2017-01-31 413 mutex_unlock(&dev->mlock); ade69e2432b795 Matias Bjørling 2017-01-31 414 900148296b78c6 Rakesh Pandit 2017-10-13 415 __module_get(tt->owner); 900148296b78c6 Rakesh Pandit 2017-10-13 416 ade69e2432b795 Matias Bjørling 2017-01-31 417 return 0; 9a69b0ed6257ae Javier González 2017-01-31 418 err_sysfs: 9a69b0ed6257ae Javier González 2017-01-31 419 if (tt->exit) a7c9e9109ca114 Javier González 2018-06-01 420 tt->exit(targetdata, true); ade69e2432b795 Matias Bjørling 2017-01-31 421 err_init: 1aabd53a4b49ad Christoph Hellwig 2021-05-21 422 blk_cleanup_disk(tdisk); ade69e2432b795 Matias Bjørling 2017-01-31 423 err_dev: edee1bdd66bf0f Javier González 2017-04-15 424 nvm_remove_tgt_dev(tgt_dev, 0); ade69e2432b795 Matias Bjørling 2017-01-31 425 err_t: ade69e2432b795 Matias Bjørling 2017-01-31 426 kfree(t); ade69e2432b795 Matias Bjørling 2017-01-31 427 err_reserve: e53927393b9987 Javier González 2018-01-05 428 nvm_release_luns_err(dev, e.lun_begin, e.lun_end); 8d77bb8276062f Rakesh Pandit 2017-04-20 429 return ret; ade69e2432b795 Matias Bjørling 2017-01-31 430 } ade69e2432b795 Matias Bjørling 2017-01-31 431 :::::: The code at line 400 was first introduced by commit :::::: ade69e2432b795c76653e1dfa09c684549826a50 lightnvm: merge gennvm with core :::::: TO: Matias Bjørling <matias(a)cnexlabs.com&gt; :::::: CC: Jens Axboe <axboe(a)fb.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org