tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   b6fc3fddade7a194bd141a49f2689e50f796ef46
commit: 539d132adc0f4dfbc798b45502d6c70ff710ec60 [2058/6121] efi: memmap: Move manipulation routines into x86 arch tree
config: arm-defconfig
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=539d132adc0f4dfbc798b45502d6c70ff710ec60
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 539d132adc0f4dfbc798b45502d6c70ff710ec60
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/firmware/efi/

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

All warnings (new ones prefixed by >>):

>> drivers/firmware/efi/memmap.c:16:13: warning: no previous prototype for '__efi_memmap_free' [-Wmissing-prototypes]
      16 | void __weak __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
         |             ^~~~~~~~~~~~~~~~~


vim +/__efi_memmap_free +16 drivers/firmware/efi/memmap.c

    15	
  > 16	void __weak __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
    17	{
    18		WARN_ON(1);
    19	}
    20	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp