tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git 20210816-add-disk-error-handling head: e1e79332ea1bba0e751529b114ef9d301bf962a5 commit: 4734b368f95c0126b06135115f9413cc00777e1b [41/64] block: make __register_blkdev() return an error config: i386-randconfig-a004-20210817 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2c6448cdc2f68f8c28fd0bd9404182b81306e6e6) 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 20210816-add-disk-error-handling git checkout 4734b368f95c0126b06135115f9413cc00777e1b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 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 >>): if (floppy_alloc_disk(drive, type) == 0) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/block/floppy.c:4540:9: note: uninitialized use occurs here return err; ^~~ drivers/block/floppy.c:4532:3: note: remove the 'if' if its condition is always true if (floppy_alloc_disk(drive, type) == 0) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/block/floppy.c:4531:6: warning: variable 'err' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (!disks[drive][type]) { ^~~~~~~~~~~~~~~~~~~ drivers/block/floppy.c:4540:9: note: uninitialized use occurs here return err; ^~~ drivers/block/floppy.c:4531:2: note: remove the 'if' if its condition is always true if (!disks[drive][type]) { ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/block/floppy.c:4524:9: note: initialize the variable 'err' to silence this warning int err; ^ = 0 2 warnings generated. vim +4532 drivers/block/floppy.c 4519 4520 static int floppy_probe(dev_t dev) 4521 { 4522 unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5); 4523 unsigned int type = (MINOR(dev) >> 2) & 0x1f; 4524 int err; 4525 4526 if (drive >= N_DRIVE || !floppy_available(drive) || 4527 type >= ARRAY_SIZE(floppy_type)) 4528 return -EINVAL; 4529 4530 mutex_lock(&floppy_probe_lock); 4531 if (!disks[drive][type]) { 4533 err = add_disk(disks[drive][type]); 4534 if (err) 4535 blk_cleanup_disk(disks[drive][type]); 4536 } 4537 } 4538 mutex_unlock(&floppy_probe_lock); 4539 4540 return err; 4541 } 4542 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org