tree: https://github.com/kdave/btrfs-devel.git misc-next head: a99530d13cc95eec4869544f8000bbf7755d671b commit: fd8e11fb8ffcb957a87dd0897b2e8c8535167391 [100/109] btrfs: simplify parameters of btrfs_sysfs_add_devices_dir config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 9.3.0 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 git checkout fd8e11fb8ffcb957a87dd0897b2e8c8535167391 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 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 >>): 1355 | int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ # https://github.com/kdave/btrfs-devel/commit/fd8e11fb8ffcb957a87dd0897b2e8... git remote add kdave-btrfs-devel https://github.com/kdave/btrfs-devel.git git fetch --no-tags kdave-btrfs-devel misc-next git checkout fd8e11fb8ffcb957a87dd0897b2e8c8535167391 vim +/btrfs_sysfs_add_fs_devices +1355 fs/btrfs/sysfs.c 1354 1356 { 1357 int ret; 1358 struct btrfs_device *device; 1359 1360 list_for_each_entry(device, &fs_devices->devices, dev_list) { 1361 ret = btrfs_sysfs_add_device(device); 1362 if (ret) 1363 return ret; 1364 } 1365 1366 return 0; 1367 } 1368 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org