linux-kernel - Re: [PATCH 10/12] hugetlb: batch PMD split for bulk vmemmap dedup

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Date:   Sun, 27 Aug 2023 02:14:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     oe-kbuild-all@...ts.linux.dev,
        Muchun Song <songmuchun@...edance.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Rientjes <rientjes@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH 10/12] hugetlb: batch PMD split for bulk vmemmap dedup

Hi Mike,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20230825]
[cannot apply to akpm-mm/mm-everything v6.5-rc7 v6.5-rc6 v6.5-rc5 linus/master v6.5-rc7]
[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/Mike-Kravetz/hugetlb-clear-flags-in-tail-pages-that-will-be-freed-individually/20230826-030805
base:   next-20230825
patch link:    https://lore.kernel.org/r/20230825190436.55045-11-mike.kravetz%40oracle.com
patch subject: [PATCH 10/12] hugetlb: batch PMD split for bulk vmemmap dedup
config: x86_64-randconfig-r031-20230826 (https://download.01.org/0day-ci/archive/20230827/202308270248.eJT8UDG3-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230827/202308270248.eJT8UDG3-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308270248.eJT8UDG3-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/hugetlb_vmemmap.c:40: warning: Function parameter or member 'flags' not described in 'vmemmap_remap_walk'


vim +40 mm/hugetlb_vmemmap.c

f41f2ed43ca525 Muchun Song  2021-06-30  19  
998a2997885f73 Muchun Song  2022-06-28  20  /**
998a2997885f73 Muchun Song  2022-06-28  21   * struct vmemmap_remap_walk - walk vmemmap page table
998a2997885f73 Muchun Song  2022-06-28  22   *
998a2997885f73 Muchun Song  2022-06-28  23   * @remap_pte:		called for each lowest-level entry (PTE).
998a2997885f73 Muchun Song  2022-06-28  24   * @nr_walked:		the number of walked pte.
998a2997885f73 Muchun Song  2022-06-28  25   * @reuse_page:		the page which is reused for the tail vmemmap pages.
998a2997885f73 Muchun Song  2022-06-28  26   * @reuse_addr:		the virtual address of the @reuse_page page.
998a2997885f73 Muchun Song  2022-06-28  27   * @vmemmap_pages:	the list head of the vmemmap pages that can be freed
998a2997885f73 Muchun Song  2022-06-28  28   *			or is mapped from.
506a27a4627ab7 Joao Martins 2023-08-25  29   * @flags		used to modify behavior in bulk operations
998a2997885f73 Muchun Song  2022-06-28  30   */
998a2997885f73 Muchun Song  2022-06-28  31  struct vmemmap_remap_walk {
998a2997885f73 Muchun Song  2022-06-28  32  	void			(*remap_pte)(pte_t *pte, unsigned long addr,
998a2997885f73 Muchun Song  2022-06-28  33  					     struct vmemmap_remap_walk *walk);
998a2997885f73 Muchun Song  2022-06-28  34  	unsigned long		nr_walked;
998a2997885f73 Muchun Song  2022-06-28  35  	struct page		*reuse_page;
998a2997885f73 Muchun Song  2022-06-28  36  	unsigned long		reuse_addr;
998a2997885f73 Muchun Song  2022-06-28  37  	struct list_head	*vmemmap_pages;
506a27a4627ab7 Joao Martins 2023-08-25  38  #define VMEMMAP_REMAP_ONLY_SPLIT	BIT(0)
506a27a4627ab7 Joao Martins 2023-08-25  39  	unsigned long		flags;
998a2997885f73 Muchun Song  2022-06-28 @40  };
998a2997885f73 Muchun Song  2022-06-28  41  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki