tree: https://github.com/intel/tdx.git guest head: 422a2465ebe67c0db36e855df7f9d7018f878c28 commit: 872c5038ebb5ae2e0dc6c08f19a5476d3ce7b40e [34/44] x86/mm: Move force_dma_unencrypted() to common code config: x86_64-randconfig-r001-20201012 (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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/intel/tdx/commit/872c5038ebb5ae2e0dc6c08f19a5476d3ce7b40e git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx guest git checkout 872c5038ebb5ae2e0dc6c08f19a5476d3ce7b40e # 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 >>): bool force_dma_unencrypted(struct device *dev) ^ arch/x86/mm/mem_encrypt_common.c:15:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool force_dma_unencrypted(struct device *dev) ^ static 1 warning generated. vim +/force_dma_unencrypted +15 arch/x86/mm/mem_encrypt_common.c 13 14 /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org