tree: https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git dm-5.19 head: d245a9c2bd77a40dab2f3393c4a413820dd6004d commit: eb4cbc43473c35198e18c9b7b82e7a26fa6e5401 [126/130] dm: optimize is_abnormal_io for normal rw IO config: i386-randconfig-c001 (https://download.01.org/0day-ci/archive/20220324/202203242338.J9k787ls-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d) 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/device-mapper/linux-dm.git/commit/?id=eb4cbc43473c35198e18c9b7b82e7a26fa6e5401 git remote add device-mapper-dm https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git git fetch --no-tags device-mapper-dm dm-5.19 git checkout eb4cbc43473c35198e18c9b7b82e7a26fa6e5401 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <yujie.liu@xxxxxxxxx> clang-analyzer warnings: (new ones prefixed by >>) >> drivers/md/dm.c:1471:2: warning: Value stored to 'num_bios' is never read [clang-analyzer-deadcode.DeadStores] num_bios = 0; ^ ~ vim +/num_bios +1471 drivers/md/dm.c 568c73a355e0b8 Mike Snitzer 2019-01-18 1462 0519c71e8d461a Mike Snitzer 2018-03-26 1463 static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti, 0519c71e8d461a Mike Snitzer 2018-03-26 1464 int *result) 0519c71e8d461a Mike Snitzer 2018-03-26 1465 { eb4cbc43473c35 Mike Snitzer 2022-03-22 1466 unsigned num_bios; eb4cbc43473c35 Mike Snitzer 2022-03-22 1467 eb4cbc43473c35 Mike Snitzer 2022-03-22 1468 if (!is_abnormal_io(ci->bio)) eb4cbc43473c35 Mike Snitzer 2022-03-22 1469 return false; 0519c71e8d461a Mike Snitzer 2018-03-26 1470 eb4cbc43473c35 Mike Snitzer 2022-03-22 @1471 num_bios = 0; e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1472 switch (bio_op(ci->bio)) { 9679b5a7ec400f Mike Snitzer 2020-09-15 1473 case REQ_OP_DISCARD: 9679b5a7ec400f Mike Snitzer 2020-09-15 1474 num_bios = ti->num_discard_bios; 9679b5a7ec400f Mike Snitzer 2020-09-15 1475 break; 9679b5a7ec400f Mike Snitzer 2020-09-15 1476 case REQ_OP_SECURE_ERASE: 9679b5a7ec400f Mike Snitzer 2020-09-15 1477 num_bios = ti->num_secure_erase_bios; 9679b5a7ec400f Mike Snitzer 2020-09-15 1478 break; 9679b5a7ec400f Mike Snitzer 2020-09-15 1479 case REQ_OP_WRITE_SAME: 9679b5a7ec400f Mike Snitzer 2020-09-15 1480 num_bios = ti->num_write_same_bios; 9679b5a7ec400f Mike Snitzer 2020-09-15 1481 break; 9679b5a7ec400f Mike Snitzer 2020-09-15 1482 case REQ_OP_WRITE_ZEROES: 9679b5a7ec400f Mike Snitzer 2020-09-15 1483 num_bios = ti->num_write_zeroes_bios; 9679b5a7ec400f Mike Snitzer 2020-09-15 1484 break; 9679b5a7ec400f Mike Snitzer 2020-09-15 1485 default: 0519c71e8d461a Mike Snitzer 2018-03-26 1486 return false; 9679b5a7ec400f Mike Snitzer 2020-09-15 1487 } num_bios will be assigned in each case. 0519c71e8d461a Mike Snitzer 2018-03-26 1488 e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1489 /* e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1490 * Even though the device advertised support for this type of e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1491 * request, that does not mean every target supports it, and e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1492 * reconfiguration might also have changed that since the e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1493 * check was performed. e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1494 */ e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1495 if (!num_bios) e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1496 *result = -EOPNOTSUPP; e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1497 else { e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1498 __send_changing_extent_only(ci, ti, num_bios); e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1499 *result = 0; e6fc9f62ce6e41 Mike Snitzer 2022-02-17 1500 } 0519c71e8d461a Mike Snitzer 2018-03-26 1501 return true; 0519c71e8d461a Mike Snitzer 2018-03-26 1502 } 0519c71e8d461a Mike Snitzer 2018-03-26 1503 -- 0-DAY CI Kernel Test Service https://01.org/lkp -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
