Re: [PATCH 1/4] hugetlb: skip to end of PT page mapping when pte not present

[kernel test robot]

Hi Mike,

I love your patch! Yet something to improve:

[auto build test ERROR on soc/for-next]
[also build test ERROR on linus/master v5.19-rc2 next-20220617]
[cannot apply to arm64/for-next/core arm/for-next kvmarm/next xilinx-xlnx/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/Mike-Kravetz/hugetlb-speed-up-linear-address-scanning/20220617-050726
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: i386-debian-10.3 (https://download.01.org/0day-ci/archive/20220618/202206180021.rcc4B1by-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/4c647687607f10fece04967b8180c0dadaf765e6
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Mike-Kravetz/hugetlb-speed-up-linear-address-scanning/20220617-050726
        git checkout 4c647687607f10fece04967b8180c0dadaf765e6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   mm/hugetlb.c: In function 'hugetlb_mask_last_page':
>> mm/hugetlb.c:6901:9: error: duplicate case value
    6901 |         case PUD_SIZE:
         |         ^~~~
   mm/hugetlb.c:6899:9: note: previously used here
    6899 |         case P4D_SIZE:
         |         ^~~~


vim +6901 mm/hugetlb.c

  6886	
  6887	/*
  6888	 * Return a mask that can be used to update an address to the last huge
  6889	 * page in a page table page mapping size.  Used to skip non-present
  6890	 * page table entries when linearly scanning address ranges.  Architectures
  6891	 * with unique huge page to page table relationships can define their own
  6892	 * version of this routine.
  6893	 */
  6894	unsigned long hugetlb_mask_last_page(struct hstate *h)
  6895	{
  6896		unsigned long hp_size = huge_page_size(h);
  6897	
  6898		switch (hp_size) {
  6899		case P4D_SIZE:
  6900			return PGDIR_SIZE - P4D_SIZE;
> 6901		case PUD_SIZE:
  6902			return P4D_SIZE - PUD_SIZE;
  6903		case PMD_SIZE:
  6904			return PUD_SIZE - PMD_SIZE;
  6905		default:
  6906			break; /* Should never happen */
  6907		}
  6908	
  6909		return ~(0UL);
  6910	}
  6911	

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