CC: linux-kernel(a)vger.kernel.org TO: Yu Chen <chen.yu(a)easystack.cn&gt; CC: Ingo Molnar <mingo(a)kernel.org&gt; CC: "Peter Zijlstra (Intel)" <peterz(a)infradead.org&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1b5044021070efa3259f3e9548dc35d1eb6aa844 commit: ba4f7bc1dee318a0fd9c0e3bd46227aca21ac2f2 sched/deadline: Make two functions static date: 3 months ago config: x86_64-randconfig-r025-20200618 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44) 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 ba4f7bc1dee318a0fd9c0e3bd46227aca21ac2f2 # 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