tree: https://github.com/intel/linux-intel-lts.git 5.10/yocto head: 4c7b560468a13c89c9ef45855297f384be254e91 commit: 64b3d759e43185dd628b5474ade8d8488d043c25 [44/8373] usb: typec: Driver for Cypress CCG USB Power Delivery Controllers config: arm-randconfig-r031-20210608 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d32cc150feb72f315a5bbd34f92e7beca21a50da) 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://github.com/intel/linux-intel-lts/commit/64b3d759e43185dd628b5474a... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.10/yocto git checkout 64b3d759e43185dd628b5474ade8d8488d043c25 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): drivers/usb/typec/ccg/hpi.c:173:1: warning: unused function 'hpi_block_read' [-Wunused-function] hpi_block_read(struct ccg_hpi *hpi, u16 reg, void *val, size_t len) ^ drivers/usb/typec/ccg/hpi.c:183:19: warning: unused function 'hpi_write16' [-Wunused-function] static inline int hpi_write16(struct ccg_hpi *hpi, u16 reg, u16 val) ^ static const struct acpi_device_id ccg_hpi_acpi_match[] = { ^ 3 warnings generated. vim +/ccg_hpi_acpi_match +500 drivers/usb/typec/ccg/hpi.c 499 501 { "INTC1030", }, 502 { "INTC1031", }, 503 { } 504 }; 505 MODULE_DEVICE_TABLE(acpi, ccg_hpi_acpi_match); 506 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org