tree: https://github.com/hnaz/linux-mm master head: bf4803abaa3e9d2fa207c0675a2d2abf0fd44f66 commit: fe343091405131f91dcb9230ae7649bb1ee7fe9a [214/410] mm/madvise: free hwpoison and swapin error entry in madvise_free_pte_range config: x86_64-rhel-8.3-func (https://download.01.org/0day-ci/archive/20220430/202204301111.d0R5xzHF-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.2.0-20) 11.2.0 reproduce (this is a W=1 build): # https://github.com/hnaz/linux-mm/commit/fe343091405131f91dcb9230ae7649bb1ee7fe9a git remote add hnaz-mm https://github.com/hnaz/linux-mm git fetch --no-tags hnaz-mm master git checkout fe343091405131f91dcb9230ae7649bb1ee7fe9a # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Note: the hnaz-mm/master HEAD bf4803abaa3e9d2fa207c0675a2d2abf0fd44f66 builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): mm/madvise.c: In function 'madvise_free_pte_range': >> mm/madvise.c:632:36: error: implicit declaration of function 'is_swapin_error_entry' [-Werror=implicit-function-declaration] 632 | is_swapin_error_entry(entry)) { | ^~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/is_swapin_error_entry +632 mm/madvise.c 587 588 static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr, 589 unsigned long end, struct mm_walk *walk) 590 591 { 592 struct mmu_gather *tlb = walk->private; 593 struct mm_struct *mm = tlb->mm; 594 struct vm_area_struct *vma = walk->vma; 595 spinlock_t *ptl; 596 pte_t *orig_pte, *pte, ptent; 597 struct page *page; 598 int nr_swap = 0; 599 unsigned long next; 600 601 next = pmd_addr_end(addr, end); 602 if (pmd_trans_huge(*pmd)) 603 if (madvise_free_huge_pmd(tlb, vma, pmd, addr, next)) 604 goto next; 605 606 if (pmd_trans_unstable(pmd)) 607 return 0; 608 609 tlb_change_page_size(tlb, PAGE_SIZE); 610 orig_pte = pte = pte_offset_map_lock(mm, pmd, addr, &ptl); 611 flush_tlb_batched_pending(mm); 612 arch_enter_lazy_mmu_mode(); 613 for (; addr != end; pte++, addr += PAGE_SIZE) { 614 ptent = *pte; 615 616 if (pte_none(ptent)) 617 continue; 618 /* 619 * If the pte has swp_entry, just clear page table to 620 * prevent swap-in which is more expensive rather than 621 * (page allocation + zeroing). 622 */ 623 if (!pte_present(ptent)) { 624 swp_entry_t entry; 625 626 entry = pte_to_swp_entry(ptent); 627 if (!non_swap_entry(entry)) { 628 nr_swap--; 629 free_swap_and_cache(entry); 630 pte_clear_not_present_full(mm, addr, pte, tlb->fullmm); 631 } else if (is_hwpoison_entry(entry) || > 632 is_swapin_error_entry(entry)) { 633 pte_clear_not_present_full(mm, addr, pte, tlb->fullmm); 634 } 635 continue; 636 } 637 638 page = vm_normal_page(vma, addr, ptent); 639 if (!page) 640 continue; 641 642 /* 643 * If pmd isn't transhuge but the page is THP and 644 * is owned by only this process, split it and 645 * deactivate all pages. 646 */ 647 if (PageTransCompound(page)) { 648 if (page_mapcount(page) != 1) 649 goto out; 650 get_page(page); 651 if (!trylock_page(page)) { 652 put_page(page); 653 goto out; 654 } 655 pte_unmap_unlock(orig_pte, ptl); 656 if (split_huge_page(page)) { 657 unlock_page(page); 658 put_page(page); 659 orig_pte = pte_offset_map_lock(mm, pmd, addr, &ptl); 660 goto out; 661 } 662 unlock_page(page); 663 put_page(page); 664 orig_pte = pte = pte_offset_map_lock(mm, pmd, addr, &ptl); 665 pte--; 666 addr -= PAGE_SIZE; 667 continue; 668 } 669 670 VM_BUG_ON_PAGE(PageTransCompound(page), page); 671 672 if (PageSwapCache(page) || PageDirty(page)) { 673 if (!trylock_page(page)) 674 continue; 675 /* 676 * If page is shared with others, we couldn't clear 677 * PG_dirty of the page. 678 */ 679 if (page_mapcount(page) != 1) { 680 unlock_page(page); 681 continue; 682 } 683 684 if (PageSwapCache(page) && !try_to_free_swap(page)) { 685 unlock_page(page); 686 continue; 687 } 688 689 ClearPageDirty(page); 690 unlock_page(page); 691 } 692 693 if (pte_young(ptent) || pte_dirty(ptent)) { 694 /* 695 * Some of architecture(ex, PPC) don't update TLB 696 * with set_pte_at and tlb_remove_tlb_entry so for 697 * the portability, remap the pte with old|clean 698 * after pte clearing. 699 */ 700 ptent = ptep_get_and_clear_full(mm, addr, pte, 701 tlb->fullmm); 702 703 ptent = pte_mkold(ptent); 704 ptent = pte_mkclean(ptent); 705 set_pte_at(mm, addr, pte, ptent); 706 tlb_remove_tlb_entry(tlb, pte, addr); 707 } 708 mark_page_lazyfree(page); 709 } 710 out: 711 if (nr_swap) { 712 if (current->mm == mm) 713 sync_mm_rss(mm); 714 715 add_mm_counter(mm, MM_SWAPENTS, nr_swap); 716 } 717 arch_leave_lazy_mmu_mode(); 718 pte_unmap_unlock(orig_pte, ptl); 719 cond_resched(); 720 next: 721 return 0; 722 } 723 -- 0-DAY CI Kernel Test Service https://01.org/lkp
