[powerpc:next-test 15/17] arch/powerpc/mm/book3s64/hash_utils.c:1986:6: warning: no previous prototype for 'kfence_protect_page'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test
head:   7c6d5b4b9e8a472043a26ccc22092aebbe65ca68
commit: 0f19bac474e0f9ce9b38a7ce00c57abb321338d1 [15/17] powerpc: Enable KFENCE on BOOK3S/64
config: powerpc-allyesconfig (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
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/powerpc/linux.git/commit/?id=0f19bac474e0f9ce9b38a7ce00c57abb321338d1
        git remote add powerpc https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
        git fetch --no-tags powerpc next-test
        git checkout 0f19bac474e0f9ce9b38a7ce00c57abb321338d1
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> arch/powerpc/mm/book3s64/hash_utils.c:1986:6: warning: no previous prototype for 'kfence_protect_page' [-Wmissing-prototypes]
    1986 | bool kfence_protect_page(unsigned long addr, bool protect)
         |      ^~~~~~~~~~~~~~~~~~~


vim +/kfence_protect_page +1986 arch/powerpc/mm/book3s64/hash_utils.c

  1984	
  1985	#ifdef CONFIG_KFENCE
> 1986	bool kfence_protect_page(unsigned long addr, bool protect)
  1987	{
  1988		unsigned long lmi = __pa(addr) >> PAGE_SHIFT;
  1989	
  1990		if (protect)
  1991			kernel_unmap_linear_page(addr, lmi);
  1992		else
  1993			kernel_map_linear_page(addr, lmi);
  1994	
  1995		return true;
  1996	}
  1997	#endif
  1998	

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