[ardb:efi-decompressor-v4 6/10] drivers/firmware/efi/libstub/zboot.c:161:23: warning: no previous prototype for function 'efi_zboot_entry'

[kernel test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git efi-decompressor-v4
head:   efcc03a013f2ddbed0ee782e5049b39432dc9db2
commit: d2c8eb1ea770556c25e2b5d884bf6bba32940bf2 [6/10] efi/libstub: implement generic EFI zboot
config: riscv-randconfig-r042-20220825 (https://download.01.org/0day-ci/archive/20220827/202208272044.kV41yO8J-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project a2100daf12fb980a29fd1a9c85ccf8eaaaf79730)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id=d2c8eb1ea770556c25e2b5d884bf6bba32940bf2
        git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git
        git fetch --no-tags ardb efi-decompressor-v4
        git checkout d2c8eb1ea770556c25e2b5d884bf6bba32940bf2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/firmware/efi/libstub/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/firmware/efi/libstub/zboot.c:161:23: warning: no previous prototype for function 'efi_zboot_entry' [-Wmissing-prototypes]
   efi_status_t __efiapi efi_zboot_entry(efi_handle_t handle,
                         ^
   drivers/firmware/efi/libstub/zboot.c:161:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   efi_status_t __efiapi efi_zboot_entry(efi_handle_t handle,
   ^
   static 
   1 warning generated.


vim +/efi_zboot_entry +161 drivers/firmware/efi/libstub/zboot.c

   160	
 > 161	efi_status_t __efiapi efi_zboot_entry(efi_handle_t handle,

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