[kbuild-all] Re: [PATCH v3] fs/btrfs: Fix uninitialized variable

Hi Khaled, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on kdave/for-next] [also build test WARNING on v5.12-rc8 next-20210420] [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] url: https://github.com/0day-ci/linux/commits/Khaled-ROMDHANI/fs-btrfs-Fix-uni... base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next config: arm-randconfig-r021-20210420 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project ca8eef7e3da8f750d7c7aa004fe426d1d34787ea) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/c05b2a58c9ed11bd753f1e64695bd89da... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Khaled-ROMDHANI/fs-btrfs-Fix-uninitialized-variable/20210420-231754 git checkout c05b2a58c9ed11bd753f1e64695bd89da715fbaa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 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 >>): default: ^~~~~~~ fs/btrfs/zoned.c:153:14: note: uninitialized use occurs here return (u32)zone; ^~~~ fs/btrfs/zoned.c:139:10: note: initialize the variable 'zone' to silence this warning u64 zone; ^ = 0 1 warning generated. vim +/zone +146 fs/btrfs/zoned.c 133 134 /* 135 * Get the first zone number of the superblock mirror 136 */ 137 static inline u32 sb_zone_number(int shift, int mirror) 138 { 139 u64 zone; 140 141 ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX); 142 switch (mirror) { 143 case 0: zone = 0; break; 144 case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break; 145 case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break; 147 ASSERT(zone); 148 break; 149 } 150 151 ASSERT(zone <= U32_MAX); 152 153 return (u32)zone; 154 } 155 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org