Hi Ethan, kernel test robot noticed the following build warnings: [auto build test WARNING on brauner-vfs/vfs.all] [also build test WARNING on linus/master v6.17-rc2 next-20250822] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Ethan-Ferguson/exfat-Add-support-for-FS_IOC_-GET-SET-FSLABEL/20250821-231649 base: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all patch link: https://lore.kernel.org/r/20250821150926.1025302-2-ethan.ferguson%40zetier.com patch subject: [PATCH v3 1/1] exfat: Add support for FS_IOC_{GET,SET}FSLABEL config: s390-randconfig-001-20250822 (https://download.01.org/0day-ci/archive/20250822/202508222315.aWhqo6ik-lkp@xxxxxxxxx/config) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project d26ea02060b1c9db751d188b2edb0059a9eb273d) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250822/202508222315.aWhqo6ik-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202508222315.aWhqo6ik-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from <built-in>:3: In file included from include/linux/compiler_types.h:171: include/linux/compiler-clang.h:37:9: warning: '__SANITIZE_THREAD__' macro redefined [-Wmacro-redefined] 37 | #define __SANITIZE_THREAD__ | ^ <built-in>:368:9: note: previous definition is here 368 | #define __SANITIZE_THREAD__ 1 | ^ >> fs/exfat/super.c:727:6: warning: variable 'bh' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] 727 | if (uniname->name_len > EXFAT_VOLUME_LABEL_LEN) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/exfat/super.c:757:6: note: uninitialized use occurs here 757 | if (bh) { | ^~ fs/exfat/super.c:727:2: note: remove the 'if' if its condition is always false 727 | if (uniname->name_len > EXFAT_VOLUME_LABEL_LEN) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 728 | ret = -EINVAL; | ~~~~~~~~~~~~~~ 729 | goto cleanup; | ~~~~~~~~~~~~~ 730 | } | ~ fs/exfat/super.c:724:24: note: initialize the variable 'bh' to silence this warning 724 | struct buffer_head *bh; | ^ | = NULL 2 warnings generated. vim +727 fs/exfat/super.c 718 719 int exfat_write_volume_label(struct super_block *sb, 720 struct exfat_uni_name *uniname) 721 { 722 int ret, i; 723 struct exfat_sb_info *sbi = EXFAT_SB(sb); 724 struct buffer_head *bh; 725 struct exfat_dentry *ep; 726 > 727 if (uniname->name_len > EXFAT_VOLUME_LABEL_LEN) { 728 ret = -EINVAL; 729 goto cleanup; 730 } 731 732 ret = exfat_get_volume_label_ptrs(sb, &bh, &ep, true); 733 if (ret < 0) 734 goto cleanup; 735 736 ret = exfat_alloc_volume_label(sb); 737 if (ret < 0) 738 goto cleanup; 739 740 memcpy(sbi->volume_label, uniname->name, 741 uniname->name_len * sizeof(short)); 742 743 mutex_lock(&sbi->s_lock); 744 for (i = 0; i < uniname->name_len; i++) 745 ep->dentry.volume_label.volume_label[i] = 746 cpu_to_le16(sbi->volume_label[i]); 747 // Fill the rest of the str with 0x0000 748 for (; i < EXFAT_VOLUME_LABEL_LEN; i++) 749 ep->dentry.volume_label.volume_label[i] = 0x0000; 750 751 ep->dentry.volume_label.char_count = uniname->name_len; 752 mutex_unlock(&sbi->s_lock); 753 754 ret = 0; 755 756 cleanup: 757 if (bh) { 758 exfat_update_bh(bh, true); 759 brelse(bh); 760 } 761 762 return ret; 763 } 764 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
