Hi Michal, FYI, the error/warning still remains. tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4 head: 629150468791671b5fde21363e643e87c5815b17 commit: 6d0468b837bc2b3cce625f59904d137e63637b5d [903/1697] usb: dwc3: Add support for clock disabling during suspend config: i386-randconfig-r015-20210112 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # 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 make W=1 ARCH=i386 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 >>): In file included from drivers/usb/dwc3/host.c:12: include/linux/usb/xhci_pdriver.h:22:6: warning: no previous prototype for 'dwc3_host_wakeup_capable' [-Wmissing-prototypes] 22 | void dwc3_host_wakeup_capable(struct device *dev, bool wakeup) | ^~~~~~~~~~~~~~~~~~~~~~~~ 16 | void dwc3_host_wakeup_capable(struct device *dev, bool wakeup) | ^~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/usb/dwc3/host.c:12: include/linux/usb/xhci_pdriver.h:22:6: note: previous definition of 'dwc3_host_wakeup_capable' was here 22 | void dwc3_host_wakeup_capable(struct device *dev, bool wakeup) | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +/dwc3_host_wakeup_capable +16 drivers/usb/dwc3/host.c 15 17 { 18 dwc3_simple_wakeup_capable(dev, wakeup); 19 } 20 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org