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/6d0468b837bc2b3cce625f59904d137e63637b5d
        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@intel.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/usb/host/xhci-plat.c:23:
>> include/linux/usb/xhci_pdriver.h:22:6: warning: no previous prototype for function 'dwc3_host_wakeup_capable' [-Wmissing-prototypes]
   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
  > 22	void dwc3_host_wakeup_capable(struct device *dev, bool wakeup)
    23	{ ; }
    24	#endif
    25	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org