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

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

Hi Mike,

kernel test robot noticed the following build errors:

[auto build test ERROR 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: s390-randconfig-001-20230826 (https://download.01.org/0day-ci/archive/20230826/202308261325.ipTttZHZ-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230826/202308261325.ipTttZHZ-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308261325.ipTttZHZ-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   mm/hugetlb_vmemmap.c:661:6: warning: no previous prototype for function 'hugetlb_vmemmap_optimize_bulk' [-Wmissing-prototypes]
     661 | void hugetlb_vmemmap_optimize_bulk(const struct hstate *h, struct page *head,
         |      ^
   mm/hugetlb_vmemmap.c:661:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     661 | void hugetlb_vmemmap_optimize_bulk(const struct hstate *h, struct page *head,
         | ^
         | static 
>> mm/hugetlb_vmemmap.c:667:6: warning: no previous prototype for function 'hugetlb_vmemmap_split' [-Wmissing-prototypes]
     667 | void hugetlb_vmemmap_split(const struct hstate *h, struct page *head)
         |      ^
   mm/hugetlb_vmemmap.c:667:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     667 | void hugetlb_vmemmap_split(const struct hstate *h, struct page *head)
         | ^
         | static 
>> mm/hugetlb_vmemmap.c:698:28: error: use of undeclared identifier 'TLB_FLUSH_ALL'
     698 |         flush_tlb_kernel_range(0, TLB_FLUSH_ALL);
         |                                   ^
   2 warnings and 1 error generated.


vim +/TLB_FLUSH_ALL +698 mm/hugetlb_vmemmap.c

   666	
 > 667	void hugetlb_vmemmap_split(const struct hstate *h, struct page *head)
   668	{
   669		unsigned long vmemmap_start = (unsigned long)head, vmemmap_end;
   670		unsigned long vmemmap_reuse;
   671	
   672		if (!vmemmap_should_optimize(h, head))
   673			return;
   674	
   675		static_branch_inc(&hugetlb_optimize_vmemmap_key);
   676	
   677		vmemmap_end     = vmemmap_start + hugetlb_vmemmap_size(h);
   678		vmemmap_reuse   = vmemmap_start;
   679		vmemmap_start   += HUGETLB_VMEMMAP_RESERVE_SIZE;
   680	
   681		/*
   682		 * Remap the vmemmap virtual address range [@vmemmap_start, @vmemmap_end)
   683		 * to the page which @vmemmap_reuse is mapped to, then free the pages
   684		 * which the range [@vmemmap_start, @vmemmap_end] is mapped to.
   685		 */
   686		if (vmemmap_remap_split(vmemmap_start, vmemmap_end, vmemmap_reuse))
   687			static_branch_dec(&hugetlb_optimize_vmemmap_key);
   688	}
   689	
   690	void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list)
   691	{
   692		struct folio *folio;
   693		LIST_HEAD(vmemmap_pages);
   694	
   695		list_for_each_entry(folio, folio_list, lru)
   696			hugetlb_vmemmap_split(h, &folio->page);
   697	
 > 698		flush_tlb_kernel_range(0, TLB_FLUSH_ALL);
   699	
   700		list_for_each_entry(folio, folio_list, lru)
   701			hugetlb_vmemmap_optimize_bulk(h, &folio->page, &vmemmap_pages);
   702	
   703		free_vmemmap_page_list(&vmemmap_pages);
   704	}
   705	

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