Re: [PATCH] efistub: LoongArch: Reimplement kernel_entry_address()

[kernel test robot <lkp@intel.com>]

Hi Youling,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on efi/next]
[also build test WARNING on linus/master v6.3-rc1 next-20230308]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Youling-Tang/efistub-LoongArch-Reimplement-kernel_entry_address/20230307-190013
base:   https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next
patch link:    https://lore.kernel.org/r/1678186653-27659-1-git-send-email-tangyouling%40loongson.cn
patch subject: [PATCH] efistub: LoongArch: Reimplement kernel_entry_address()
config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20230309/202303090430.e6BB0Txr-lkp@intel.com/config)
compiler: loongarch64-linux-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://github.com/intel-lab-lkp/linux/commit/1f509b49ceeeeb3c59483c685592f8d87b70f169
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Youling-Tang/efistub-LoongArch-Reimplement-kernel_entry_address/20230307-190013
        git checkout 1f509b49ceeeeb3c59483c685592f8d87b70f169
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash drivers/firmware/efi/libstub/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303090430.e6BB0Txr-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/firmware/efi/libstub/loongarch.c: In function 'get_kernel_offset':
   drivers/firmware/efi/libstub/loongarch.c:46:45: error: 'PHYS_LINK_KADDR' undeclared (first use in this function)
      46 |         return EFI_KIMG_PREFERRED_ADDRESS - PHYS_LINK_KADDR;
         |                                             ^~~~~~~~~~~~~~~
   drivers/firmware/efi/libstub/loongarch.c:46:45: note: each undeclared identifier is reported only once for each function it appears in
   drivers/firmware/efi/libstub/loongarch.c: At top level:
>> drivers/firmware/efi/libstub/loongarch.c:49:15: warning: no previous prototype for 'kernel_entry_address' [-Wmissing-prototypes]
      49 | unsigned long kernel_entry_address(void)
         |               ^~~~~~~~~~~~~~~~~~~~
   drivers/firmware/efi/libstub/loongarch.c: In function 'get_kernel_offset':
   drivers/firmware/efi/libstub/loongarch.c:47:1: error: control reaches end of non-void function [-Werror=return-type]
      47 | }
         | ^
   cc1: some warnings being treated as errors


vim +/kernel_entry_address +49 drivers/firmware/efi/libstub/loongarch.c

    48	
  > 49	unsigned long kernel_entry_address(void)
    50	{
    51		return *(unsigned long *)(EFI_KIMG_PREFERRED_ADDRESS + 8) +
    52			get_kernel_offset();
    53	}
    54	

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