Hi Daniel, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on 10b82d5176488acee2820e5a2cf0f2ec5c3488b6] url: https://github.com/0day-ci/linux/commits/Daniel-Latypov/kunit-introduce-c... base: 10b82d5176488acee2820e5a2cf0f2ec5c3488b6 config: arm64-randconfig-r003-20201012 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project a324d8f964bf421fa7d8b882b0f64ead28c4149c) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/d69578f4d0c866b86936aace570ecc5cc... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Daniel-Latypov/kunit-introduce-class-mocking-support/20201013-062218 git checkout d69578f4d0c866b86936aace570ecc5cc7f4c505 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): #include "string-stream.h" ^~~~~~~~~~~~~~~~~ 1 error generated. vim +12 lib/kunit/debugfs.c e2219db280e3fe Alan Maguire 2020-03-26 11 e2219db280e3fe Alan Maguire 2020-03-26 @12 #include "string-stream.h" e2219db280e3fe Alan Maguire 2020-03-26 13 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org