tree: https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git for-5.9/core head: 470376737e88dc8e453f3d2739447c130f8ebeb6 commit: 470376737e88dc8e453f3d2739447c130f8ebeb6 [4/4] HID: allow building hid.ko as an external module config: x86_64-allyesconfig (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 470376737e88dc8e453f3d2739447c130f8ebeb6 # 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 errors (new ones prefixed by >>): #include "client.h" ^~~~~~~~~~ 1 error generated. -- #include "ishtp-dev.h" ^~~~~~~~~~~~~ 1 error generated. vim +12 drivers/hid/intel-ish-hid/ipc/ipc.c ae02e5d40d5f82 Srinivas Pandruvada 2016-08-07 @12 #include "client.h" ae02e5d40d5f82 Srinivas Pandruvada 2016-08-07 13 #include "hw-ish.h" ae02e5d40d5f82 Srinivas Pandruvada 2016-08-07 14 #include "hbm.h" ae02e5d40d5f82 Srinivas Pandruvada 2016-08-07 15 :::::: The code at line 12 was first introduced by commit :::::: ae02e5d40d5f829c589412c6253f925e35cf7a22 HID: intel-ish-hid: ipc layer :::::: TO: Srinivas Pandruvada <srinivas.pandruvada(a)linux.intel.com&gt; :::::: CC: Jiri Kosina <jkosina(a)suse.cz&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org