Hi Johannes, I love your patch! Yet something to improve: [auto build test ERROR on v5.8-rc5] [cannot apply to kdave/for-next btrfs/next next-20200713] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Johannes-Thumshirn/Two-furhter-a... base: 11ba468877bb23f28956a35e896356252d63c983 config: x86_64-randconfig-a016-20200713 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) 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 # 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 error/warnings (new ones prefixed by >>): In file included from <built-in>:1: In file included from ./usr/include/linux/btrfs_tree.h:5: static_assert(sizeof(struct btrfs_ioctl_vol_args) == 4096); ^ ./usr/include/linux/btrfs.h:35:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_vol_args) == 4096); ^ static_assert(sizeof(struct btrfs_ioctl_vol_args) == 4096); ^ int ./usr/include/linux/btrfs.h:192:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_scrub_args) == 1024); ^ ./usr/include/linux/btrfs.h:192:15: error: expected ')' ./usr/include/linux/btrfs.h:192:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_scrub_args) == 1024); ^ ./usr/include/linux/btrfs.h:192:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_scrub_args) == 1024); ^ int ./usr/include/linux/btrfs.h:245:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_dev_info_args) == 4096); ^ ./usr/include/linux/btrfs.h:245:15: error: expected ')' ./usr/include/linux/btrfs.h:245:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_dev_info_args) == 4096); ^ ./usr/include/linux/btrfs.h:245:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_dev_info_args) == 4096); ^ int ./usr/include/linux/btrfs.h:274:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_fs_info_args) == 1024); ^ ./usr/include/linux/btrfs.h:274:15: error: expected ')' ./usr/include/linux/btrfs.h:274:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_fs_info_args) == 1024); ^ ./usr/include/linux/btrfs.h:274:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_fs_info_args) == 1024); ^ int ./usr/include/linux/btrfs.h:457:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_balance_args) == 1024); ^ ./usr/include/linux/btrfs.h:457:15: error: expected ')' ./usr/include/linux/btrfs.h:457:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_balance_args) == 1024); ^ ./usr/include/linux/btrfs.h:457:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_balance_args) == 1024); ^ int ./usr/include/linux/btrfs.h:465:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_ino_lookup_args) == 4096); ^ ./usr/include/linux/btrfs.h:465:15: error: expected ')' ./usr/include/linux/btrfs.h:465:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_ino_lookup_args) == 4096); ^ ./usr/include/linux/btrfs.h:465:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_ino_lookup_args) == 4096); ^ int ./usr/include/linux/btrfs.h:481:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_ino_lookup_user_args) == 4096); ^ ./usr/include/linux/btrfs.h:481:15: error: expected ')' ./usr/include/linux/btrfs.h:481:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_ino_lookup_user_args) == 4096); ^ ./usr/include/linux/btrfs.h:481:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_ino_lookup_user_args) == 4096); ^ int ./usr/include/linux/btrfs.h:560:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_search_args) == 4096); ^ ./usr/include/linux/btrfs.h:560:15: error: expected ')' ./usr/include/linux/btrfs.h:560:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_search_args) == 4096); ^ ./usr/include/linux/btrfs.h:560:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_search_args) == 4096); ^ int ./usr/include/linux/btrfs.h:718:15: error: expected parameter declarator static_assert(sizeof(struct btrfs_ioctl_get_dev_stats) == 1032); ^ ./usr/include/linux/btrfs.h:718:15: error: expected ')' ./usr/include/linux/btrfs.h:718:14: note: to match this '(' static_assert(sizeof(struct btrfs_ioctl_get_dev_stats) == 1032); ^ ./usr/include/linux/btrfs.h:718:1: warning: declaration specifier missing, defaulting to 'int' static_assert(sizeof(struct btrfs_ioctl_get_dev_stats) == 1032); ^ int 9 warnings and 18 errors generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org