tree: https://github.com/intel/tdx.git guest head: 41fe88a1b3c28543f49fa6ed9e0e9b6650ed7614 commit: e6712c98ae60430d8f0d207fa3352e408a56c69f [36/144] x86/mm: Move force_dma_unencrypted() to common code config: x86_64-buildonly-randconfig-r002-20211109 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 63ef0e17e28827eae53133b3467bdac7d9729318) 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 # https://github.com/intel/tdx/commit/e6712c98ae60430d8f0d207fa3352e408a56c69f git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx guest git checkout e6712c98ae60430d8f0d207fa3352e408a56c69f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 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 errors (new ones prefixed by >>): bool force_dma_unencrypted(struct device *dev) ^ arch/x86/mm/mem_encrypt_common.c:14:1: 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 error generated. vim +/force_dma_unencrypted +14 arch/x86/mm/mem_encrypt_common.c 12 13 /* 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