tree: https://github.com/kdave/btrfs-devel.git ext/aota/zoned-7 head: 17046312f8c0a16a96b4b3a145f4b30be84e6ede commit: d7a064645672c0cb922ca0bc60c687d22f0c1fa4 [132/162] btrfs: implement log-structured superblock for ZONED mode config: x86_64-randconfig-a006-20200913 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b2c32c90bab09a6e2c1f370429db26017a182143) 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 git checkout d7a064645672c0cb922ca0bc60c687d22f0c1fa4 # 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 >>): return ret; ^~~ fs/btrfs/zoned.c:575:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 warning generated. # https://github.com/kdave/btrfs-devel/commit/d7a064645672c0cb922ca0bc60c68... git remote add kdave-btrfs-devel https://github.com/kdave/btrfs-devel.git git fetch --no-tags kdave-btrfs-devel ext/aota/zoned-7 git checkout d7a064645672c0cb922ca0bc60c687d22f0c1fa4 vim +/ret +598 fs/btrfs/zoned.c 570 571 int btrfs_advance_sb_log(struct btrfs_device *device, int mirror) 572 { 573 struct btrfs_zoned_device_info *zinfo = device->zone_info; 574 struct blk_zone *zone; 575 int ret; 576 577 if (!is_sb_log_zone(zinfo, mirror)) 578 return 0; 579 580 zone = &zinfo->sb_zones[2 * mirror]; 581 if (zone->cond != BLK_ZONE_COND_FULL) { 582 if (zone->cond == BLK_ZONE_COND_EMPTY) 583 zone->cond = BLK_ZONE_COND_IMP_OPEN; 584 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT); 585 if (zone->wp == zone->start + zone->len) 586 zone->cond = BLK_ZONE_COND_FULL; 587 return 0; 588 } 589 590 zone++; 591 ASSERT(zone->cond != BLK_ZONE_COND_FULL); 592 if (zone->cond == BLK_ZONE_COND_EMPTY) 593 zone->cond = BLK_ZONE_COND_IMP_OPEN; 594 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT); 595 if (zone->wp == zone->start + zone->len) 596 zone->cond = BLK_ZONE_COND_FULL; 597 599 } 600 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org