Hi Yu, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/x86/core] [also build test ERROR on tip/x86/mm tip/sched/core linus/master v5.12-rc2] [cannot apply to cgroup/for-next tip/perf/core hnaz-linux-mm/master next-20210312] [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/0day-ci/linux/commits/Yu-Zhao/Multigenerational-LRU/20... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git d0962f2b24c99889a386f0658c71535f56358f77 config: mips-randconfig-r036-20210313 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project dfd27ebbd0eb137c9a439b7c537bb87ba903efd3) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/0day-ci/linux/commit/7a8b80d7f0d02852d49395fc6e0357438... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Yu-Zhao/Multigenerational-LRU/20210313-160036 git checkout 7a8b80d7f0d02852d49395fc6e035743816f6b1d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): if (IS_ENABLED(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG) && !pmd_young(pmd)) ^ mm/vmscan.c:4776:56: note: did you mean 'pte_young'? arch/mips/include/asm/pgtable.h:365:19: note: 'pte_young' declared here static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } ^ unsigned long pfn = pmd_pfn(*pmd); ^ mm/vmscan.c:4851:23: note: did you mean 'pmd_off'? include/linux/pgtable.h:131:22: note: 'pmd_off' declared here static inline pmd_t *pmd_off(struct mm_struct *mm, unsigned long va) ^ mm/vmscan.c:4853:30: error: implicit declaration of function 'pmd_young' [-Werror,-Wimplicit-function-declaration] if (!pmd_present(*pmd) || !pmd_young(*pmd) || is_huge_zero_pmd(*pmd)) ^ if (pmd_dirty(*pmd) && !PageDirty(page) && ^ mm/vmscan.c:4882:7: note: did you mean 'pte_dirty'? arch/mips/include/asm/pgtable.h:364:19: note: 'pte_dirty' declared here static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } ^ 4 errors generated. vim +/pmd_young +4776 mm/vmscan.c 4c59e20072808a Yu Zhao 2021-03-13 4759 4c59e20072808a Yu Zhao 2021-03-13 4760 static int walk_pte_range(pmd_t *pmdp, unsigned long start, unsigned long end, 4c59e20072808a Yu Zhao 2021-03-13 4761 struct mm_walk *walk) 4c59e20072808a Yu Zhao 2021-03-13 4762 { 4c59e20072808a Yu Zhao 2021-03-13 4763 pmd_t pmd; 4c59e20072808a Yu Zhao 2021-03-13 4764 pte_t *pte; 4c59e20072808a Yu Zhao 2021-03-13 4765 spinlock_t *ptl; 4c59e20072808a Yu Zhao 2021-03-13 4766 struct mm_walk_args *args = walk->private; 4c59e20072808a Yu Zhao 2021-03-13 4767 int old_gen, new_gen = lru_gen_from_seq(args->max_seq); 4c59e20072808a Yu Zhao 2021-03-13 4768 4c59e20072808a Yu Zhao 2021-03-13 4769 pmd = pmd_read_atomic(pmdp); 4c59e20072808a Yu Zhao 2021-03-13 4770 barrier(); 4c59e20072808a Yu Zhao 2021-03-13 4771 if (!pmd_present(pmd) || pmd_trans_huge(pmd)) 4c59e20072808a Yu Zhao 2021-03-13 4772 return 0; 4c59e20072808a Yu Zhao 2021-03-13 4773 4c59e20072808a Yu Zhao 2021-03-13 4774 VM_BUG_ON(pmd_huge(pmd) || pmd_devmap(pmd) || is_hugepd(__hugepd(pmd_val(pmd)))); 4c59e20072808a Yu Zhao 2021-03-13 4775 4c59e20072808a Yu Zhao 2021-03-13 @4776 if (IS_ENABLED(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG) && !pmd_young(pmd)) 4c59e20072808a Yu Zhao 2021-03-13 4777 return 0; 4c59e20072808a Yu Zhao 2021-03-13 4778 4c59e20072808a Yu Zhao 2021-03-13 4779 pte = pte_offset_map_lock(walk->mm, &pmd, start, &ptl); 4c59e20072808a Yu Zhao 2021-03-13 4780 arch_enter_lazy_mmu_mode(); 4c59e20072808a Yu Zhao 2021-03-13 4781 4c59e20072808a Yu Zhao 2021-03-13 4782 for (; start != end; pte++, start += PAGE_SIZE) { 4c59e20072808a Yu Zhao 2021-03-13 4783 struct page *page; 4c59e20072808a Yu Zhao 2021-03-13 4784 unsigned long pfn = pte_pfn(*pte); 4c59e20072808a Yu Zhao 2021-03-13 4785 4c59e20072808a Yu Zhao 2021-03-13 4786 if (!pte_present(*pte) || !pte_young(*pte) || is_zero_pfn(pfn)) 4c59e20072808a Yu Zhao 2021-03-13 4787 continue; 4c59e20072808a Yu Zhao 2021-03-13 4788 4c59e20072808a Yu Zhao 2021-03-13 4789 /* 4c59e20072808a Yu Zhao 2021-03-13 4790 * If this pte maps a page from a different node, set the 4c59e20072808a Yu Zhao 2021-03-13 4791 * bitmap to prevent the accessed bit on its parent pmd from 4c59e20072808a Yu Zhao 2021-03-13 4792 * being cleared. 4c59e20072808a Yu Zhao 2021-03-13 4793 */ 4c59e20072808a Yu Zhao 2021-03-13 4794 if (pfn < args->start_pfn || pfn >= args->end_pfn) { 4c59e20072808a Yu Zhao 2021-03-13 4795 args->addr_bitmap |= get_addr_mask(start); 4c59e20072808a Yu Zhao 2021-03-13 4796 continue; 4c59e20072808a Yu Zhao 2021-03-13 4797 } 4c59e20072808a Yu Zhao 2021-03-13 4798 4c59e20072808a Yu Zhao 2021-03-13 4799 page = compound_head(pte_page(*pte)); 4c59e20072808a Yu Zhao 2021-03-13 4800 if (page_to_nid(page) != args->node_id) { 4c59e20072808a Yu Zhao 2021-03-13 4801 args->addr_bitmap |= get_addr_mask(start); 4c59e20072808a Yu Zhao 2021-03-13 4802 continue; 4c59e20072808a Yu Zhao 2021-03-13 4803 } 4c59e20072808a Yu Zhao 2021-03-13 4804 if (page_memcg_rcu(page) != args->memcg) 4c59e20072808a Yu Zhao 2021-03-13 4805 continue; 4c59e20072808a Yu Zhao 2021-03-13 4806 4c59e20072808a Yu Zhao 2021-03-13 4807 if (ptep_test_and_clear_young(walk->vma, start, pte)) { 4c59e20072808a Yu Zhao 2021-03-13 4808 old_gen = page_update_lru_gen(page, new_gen); 4c59e20072808a Yu Zhao 2021-03-13 4809 if (old_gen >= 0 && old_gen != new_gen) { 4c59e20072808a Yu Zhao 2021-03-13 4810 update_batch_size(page, old_gen, new_gen); 4c59e20072808a Yu Zhao 2021-03-13 4811 args->batch_size++; 4c59e20072808a Yu Zhao 2021-03-13 4812 } 4c59e20072808a Yu Zhao 2021-03-13 4813 } 4c59e20072808a Yu Zhao 2021-03-13 4814 4c59e20072808a Yu Zhao 2021-03-13 4815 if (pte_dirty(*pte) && !PageDirty(page) && 4c59e20072808a Yu Zhao 2021-03-13 4816 !(PageAnon(page) && PageSwapBacked(page) && !PageSwapCache(page))) 4c59e20072808a Yu Zhao 2021-03-13 4817 set_page_dirty(page); 4c59e20072808a Yu Zhao 2021-03-13 4818 } 4c59e20072808a Yu Zhao 2021-03-13 4819 4c59e20072808a Yu Zhao 2021-03-13 4820 arch_leave_lazy_mmu_mode(); 4c59e20072808a Yu Zhao 2021-03-13 4821 pte_unmap_unlock(pte, ptl); 4c59e20072808a Yu Zhao 2021-03-13 4822 4c59e20072808a Yu Zhao 2021-03-13 4823 return 0; 4c59e20072808a Yu Zhao 2021-03-13 4824 } 4c59e20072808a Yu Zhao 2021-03-13 4825 4c59e20072808a Yu Zhao 2021-03-13 4826 static int walk_pmd_range(pud_t *pudp, unsigned long start, unsigned long end, 4c59e20072808a Yu Zhao 2021-03-13 4827 struct mm_walk *walk) 4c59e20072808a Yu Zhao 2021-03-13 4828 { 4c59e20072808a Yu Zhao 2021-03-13 4829 pud_t pud; 4c59e20072808a Yu Zhao 2021-03-13 4830 pmd_t *pmd; 4c59e20072808a Yu Zhao 2021-03-13 4831 spinlock_t *ptl; 4c59e20072808a Yu Zhao 2021-03-13 4832 struct mm_walk_args *args = walk->private; 4c59e20072808a Yu Zhao 2021-03-13 4833 int old_gen, new_gen = lru_gen_from_seq(args->max_seq); 4c59e20072808a Yu Zhao 2021-03-13 4834 4c59e20072808a Yu Zhao 2021-03-13 4835 pud = READ_ONCE(*pudp); 4c59e20072808a Yu Zhao 2021-03-13 4836 if (!pud_present(pud) || WARN_ON_ONCE(pud_trans_huge(pud))) 4c59e20072808a Yu Zhao 2021-03-13 4837 return 0; 4c59e20072808a Yu Zhao 2021-03-13 4838 4c59e20072808a Yu Zhao 2021-03-13 4839 VM_BUG_ON(pud_huge(pud) || pud_devmap(pud) || is_hugepd(__hugepd(pud_val(pud)))); 4c59e20072808a Yu Zhao 2021-03-13 4840 4c59e20072808a Yu Zhao 2021-03-13 4841 if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && 4c59e20072808a Yu Zhao 2021-03-13 4842 !IS_ENABLED(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG)) 4c59e20072808a Yu Zhao 2021-03-13 4843 goto done; 4c59e20072808a Yu Zhao 2021-03-13 4844 4c59e20072808a Yu Zhao 2021-03-13 4845 pmd = pmd_offset(&pud, start); 4c59e20072808a Yu Zhao 2021-03-13 4846 ptl = pmd_lock(walk->mm, pmd); 4c59e20072808a Yu Zhao 2021-03-13 4847 arch_enter_lazy_mmu_mode(); 4c59e20072808a Yu Zhao 2021-03-13 4848 4c59e20072808a Yu Zhao 2021-03-13 4849 for (; start != end; pmd++, start = pmd_addr_end(start, end)) { 4c59e20072808a Yu Zhao 2021-03-13 4850 struct page *page; 4c59e20072808a Yu Zhao 2021-03-13 @4851 unsigned long pfn = pmd_pfn(*pmd); 4c59e20072808a Yu Zhao 2021-03-13 4852 4c59e20072808a Yu Zhao 2021-03-13 4853 if (!pmd_present(*pmd) || !pmd_young(*pmd) || is_huge_zero_pmd(*pmd)) 4c59e20072808a Yu Zhao 2021-03-13 4854 continue; 4c59e20072808a Yu Zhao 2021-03-13 4855 4c59e20072808a Yu Zhao 2021-03-13 4856 if (!pmd_trans_huge(*pmd)) { 4c59e20072808a Yu Zhao 2021-03-13 4857 if (!(args->addr_bitmap & get_addr_mask(start)) && 4c59e20072808a Yu Zhao 2021-03-13 4858 (!(pmd_addr_end(start, end) & ~PMD_MASK) || 4c59e20072808a Yu Zhao 2021-03-13 4859 !walk->vma->vm_next || 4c59e20072808a Yu Zhao 2021-03-13 4860 (walk->vma->vm_next->vm_start & PMD_MASK) > end)) 4c59e20072808a Yu Zhao 2021-03-13 4861 pmdp_test_and_clear_young(walk->vma, start, pmd); 4c59e20072808a Yu Zhao 2021-03-13 4862 continue; 4c59e20072808a Yu Zhao 2021-03-13 4863 } 4c59e20072808a Yu Zhao 2021-03-13 4864 4c59e20072808a Yu Zhao 2021-03-13 4865 if (pfn < args->start_pfn || pfn >= args->end_pfn) 4c59e20072808a Yu Zhao 2021-03-13 4866 continue; 4c59e20072808a Yu Zhao 2021-03-13 4867 4c59e20072808a Yu Zhao 2021-03-13 4868 page = pmd_page(*pmd); 4c59e20072808a Yu Zhao 2021-03-13 4869 if (page_to_nid(page) != args->node_id) 4c59e20072808a Yu Zhao 2021-03-13 4870 continue; 4c59e20072808a Yu Zhao 2021-03-13 4871 if (page_memcg_rcu(page) != args->memcg) 4c59e20072808a Yu Zhao 2021-03-13 4872 continue; 4c59e20072808a Yu Zhao 2021-03-13 4873 4c59e20072808a Yu Zhao 2021-03-13 4874 if (pmdp_test_and_clear_young(walk->vma, start, pmd)) { 4c59e20072808a Yu Zhao 2021-03-13 4875 old_gen = page_update_lru_gen(page, new_gen); 4c59e20072808a Yu Zhao 2021-03-13 4876 if (old_gen >= 0 && old_gen != new_gen) { 4c59e20072808a Yu Zhao 2021-03-13 4877 update_batch_size(page, old_gen, new_gen); 4c59e20072808a Yu Zhao 2021-03-13 4878 args->batch_size++; 4c59e20072808a Yu Zhao 2021-03-13 4879 } 4c59e20072808a Yu Zhao 2021-03-13 4880 } 4c59e20072808a Yu Zhao 2021-03-13 4881 4c59e20072808a Yu Zhao 2021-03-13 @4882 if (pmd_dirty(*pmd) && !PageDirty(page) && 4c59e20072808a Yu Zhao 2021-03-13 4883 !(PageAnon(page) && PageSwapBacked(page) && !PageSwapCache(page))) 4c59e20072808a Yu Zhao 2021-03-13 4884 set_page_dirty(page); 4c59e20072808a Yu Zhao 2021-03-13 4885 } 4c59e20072808a Yu Zhao 2021-03-13 4886 4c59e20072808a Yu Zhao 2021-03-13 4887 arch_leave_lazy_mmu_mode(); 4c59e20072808a Yu Zhao 2021-03-13 4888 spin_unlock(ptl); 4c59e20072808a Yu Zhao 2021-03-13 4889 done: 4c59e20072808a Yu Zhao 2021-03-13 4890 args->addr_bitmap = 0; 4c59e20072808a Yu Zhao 2021-03-13 4891 4c59e20072808a Yu Zhao 2021-03-13 4892 if (args->batch_size < MAX_BATCH_SIZE) 4c59e20072808a Yu Zhao 2021-03-13 4893 return 0; 4c59e20072808a Yu Zhao 2021-03-13 4894 4c59e20072808a Yu Zhao 2021-03-13 4895 args->next_addr = end; 4c59e20072808a Yu Zhao 2021-03-13 4896 4c59e20072808a Yu Zhao 2021-03-13 4897 return -EAGAIN; 4c59e20072808a Yu Zhao 2021-03-13 4898 } 4c59e20072808a Yu Zhao 2021-03-13 4899 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org