tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20210708-block-fixes-v2 head: db0174e39de7dc941f158ce53ee3af95b1635b62 commit: 2903597b8e65371aac6825294c9d99c2c36c94fd [41/89] block/rsxx: add error handling support for add_disk() config: x86_64-randconfig-a001-20210715 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 0e49c54a8cbd3e779e5526a5888c683c01cc3c50) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/com... git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git git fetch --no-tags mcgrof-next 20210708-block-fixes-v2 git checkout 2903597b8e65371aac6825294c9d99c2c36c94fd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>): if (enable_blkdev) { ^~~~~~~~~~~~~ drivers/block/rsxx/dev.c:212:6: note: uninitialized use occurs here if (err) ^~~ drivers/block/rsxx/dev.c:200:2: note: remove the 'if' if its condition is always true if (enable_blkdev) { ^~~~~~~~~~~~~~~~~~~ drivers/block/rsxx/dev.c:195:9: note: initialize the variable 'err' to silence this warning int err; ^ = 0 1 warning generated. vim +200 drivers/block/rsxx/dev.c 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 192 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 193 int rsxx_attach_dev(struct rsxx_cardinfo *card) 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 194 { 2903597b8e6537 Luis Chamberlain 2021-07-13 195 int err; 2903597b8e6537 Luis Chamberlain 2021-07-13 196 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 197 mutex_lock(&card->dev_lock); 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 198 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 199 /* The block device requires the stripe size from the config. */ 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 @200 if (enable_blkdev) { 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 201 if (card->config_valid) 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 202 set_capacity(card->gendisk, card->size8 >> 9); 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 203 else 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 204 set_capacity(card->gendisk, 0); 2903597b8e6537 Luis Chamberlain 2021-07-13 205 err = device_add_disk(CARD_TO_DEV(card), card->gendisk, NULL); 2903597b8e6537 Luis Chamberlain 2021-07-13 206 if (err == 0) 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 207 card->bdev_attached = 1; 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 208 } 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 209 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 210 mutex_unlock(&card->dev_lock); 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 211 2903597b8e6537 Luis Chamberlain 2021-07-13 212 if (err) 2903597b8e6537 Luis Chamberlain 2021-07-13 213 blk_cleanup_disk(card->gendisk); 2903597b8e6537 Luis Chamberlain 2021-07-13 214 2903597b8e6537 Luis Chamberlain 2021-07-13 215 return err; 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 216 } 8722ff8cdbfac9 josh.h.morris(a)us.ibm.com 2013-02-05 217 :::::: The code at line 200 was first introduced by commit :::::: 8722ff8cdbfac9c1b20e67bb067b455c48cb8e93 block: IBM RamSan 70/80 device driver :::::: TO: josh.h.morris(a)us.ibm.com <josh.h.morris(a)us.ibm.com&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