[PATCH] arm64/hugetlb: Implement arm64 specific hugetlb_mask_last_hp

[kernel test robot]

Hi Baolin,

I love your patch! Perhaps something to improve:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on linus/master]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Baolin-Wang/arm64-hugetlb-Implement-arm64-specific-hugetlb_mask_last_hp/20220616-113640
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20220616/202206161633.yB7NR9sh-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.3.0
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://github.com/intel-lab-lkp/linux/commit/f1309dfbc2b70ec5dd72ac38e95a49b7be42b9b6
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Baolin-Wang/arm64-hugetlb-Implement-arm64-specific-hugetlb_mask_last_hp/20220616-113640
        git checkout f1309dfbc2b70ec5dd72ac38e95a49b7be42b9b6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/mm/

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

All warnings (new ones prefixed by >>):

>> arch/arm64/mm/hugetlbpage.c:371:15: warning: no previous prototype for 'hugetlb_mask_last_hp' [-Wmissing-prototypes]
     371 | unsigned long hugetlb_mask_last_hp(struct hstate *h)
         |               ^~~~~~~~~~~~~~~~~~~~


vim +/hugetlb_mask_last_hp +371 arch/arm64/mm/hugetlbpage.c

   370	
 > 371	unsigned long hugetlb_mask_last_hp(struct hstate *h)
   372	{
   373		unsigned long hp_size = huge_page_size(h);
   374	
   375		switch (hp_size) {
   376		case PUD_SIZE:
   377			return PGDIR_SIZE - PUD_SIZE;
   378		case CONT_PMD_SIZE:
   379			return PUD_SIZE - CONT_PMD_SIZE;
   380		case PMD_SIZE:
   381			return PUD_SIZE - PMD_SIZE;
   382		case CONT_PTE_SIZE:
   383			return PMD_SIZE - CONT_PTE_SIZE;
   384		default:
   385			break;
   386		}
   387	
   388		return ~0UL;
   389	}
   390	

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