tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 9ae1fbdeabd3b3f668ad0bcb47d64b3a9fb4f8fc commit: cb17820ef71ed70f70ee1eed2b378664746b6fde [10069/11322] regulator: sy7636a: Remove requirement on sy7636a mfd config: arm-randconfig-r016-20211025 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a461fa64bb37cffd73f683c74f6b0780379fc2ca) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout cb17820ef71ed70f70ee1eed2b378664746b6fde # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/regulator/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-next/master HEAD 9ae1fbdeabd3b3f668ad0bcb47d64b3a9fb4f8fc builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): #include <linux/mfd/sy7636a.h> ^~~~~~~~~~~~~~~~~~~~~ 1 error generated. vim +14 drivers/regulator/sy7636a-regulator.c 8c485bedfb7852 Alistair Francis 2021-06-15 9 8c485bedfb7852 Alistair Francis 2021-06-15 10 #include <linux/module.h> 8c485bedfb7852 Alistair Francis 2021-06-15 11 #include <linux/platform_device.h> 8c485bedfb7852 Alistair Francis 2021-06-15 12 #include <linux/regmap.h> 8c485bedfb7852 Alistair Francis 2021-06-15 13 #include <linux/gpio/consumer.h> 8c485bedfb7852 Alistair Francis 2021-06-15 @14 #include <linux/mfd/sy7636a.h> 8c485bedfb7852 Alistair Francis 2021-06-15 15 :::::: The code at line 14 was first introduced by commit :::::: 8c485bedfb7852fa4de2a34aac2a6fd911f539f4 regulator: sy7636a: Initial commit :::::: TO: Alistair Francis <alistair(a)alistair23.me&gt; :::::: CC: Mark Brown <broonie(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org