Hi Michal, FYI, the error/warning still remains. tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4 head: d128303e4c53bcf7775c46771bf64c71596f3303 commit: 6d0468b837bc2b3cce625f59904d137e63637b5d [903/1762] usb: dwc3: Add support for clock disabling during suspend config: x86_64-randconfig-a012-20210615 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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/Xilinx/linux-xlnx/commit/6d0468b837bc2b3cce625f59904d1... git remote add xlnx https://github.com/Xilinx/linux-xlnx git fetch --no-tags xlnx xlnx_rebase_v5.4 git checkout 6d0468b837bc2b3cce625f59904d137e63637b5d # 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 >>): In file included from drivers/usb/host/xhci-plat.c:23: void dwc3_host_wakeup_capable(struct device *dev, bool wakeup) ^ include/linux/usb/xhci_pdriver.h:22:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void dwc3_host_wakeup_capable(struct device *dev, bool wakeup) ^ static 1 warning generated. vim +/dwc3_host_wakeup_capable +22 include/linux/usb/xhci_pdriver.h 20 21 #else 23 { ; } 24 #endif 25 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org