TO: "Jan Alexander Steffens (heftig)" <jan.steffens(a)gmail.com&gt; tree: https://github.com/zen-kernel/zen-kernel 5.7/zen-sauce head: 9555af4960645728364e3b2aaae65e6ea7df0062 commit: 97095505948bd7eec20a9ebcbb579126e6949d2a [3/22] ZEN: Enable additional CPU Optimizations for GCC v10.1+ / Kernel v5.7+ config: x86_64-randconfig-r026-20200607 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e429cffd4f228f70c1d9df0e5d77c08590dd9766) 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 git checkout 97095505948bd7eec20a9ebcbb579126e6949d2a # 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 warnings (new ones prefixed by >>, old ones prefixed by <<): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org