tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 0fc4bfab2cd45f9acb86c4f04b5191e114e901ed commit: 4627108658d68fad359600dbe667b88b501cee71 [7701/8232] mm/vmscan: avoid split lazyfree THP during shrink_folio_list() config: x86_64-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20240626/202406260514.SLhNM9kQ-lkp@xxxxxxxxx/config) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240626/202406260514.SLhNM9kQ-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202406260514.SLhNM9kQ-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> mm/huge_memory.c:2735:31: warning: variable 'page' is uninitialized when used here [-Wuninitialized] 2735 | folio_remove_rmap_pmd(folio, page, vma); | ^~~~ mm/huge_memory.c:2699:19: note: initialize the variable 'page' to silence this warning 2699 | struct page *page; | ^ | = NULL 1 warning generated. vim +/page +2735 mm/huge_memory.c 2691 2692 static bool __discard_anon_folio_pmd_locked(struct vm_area_struct *vma, 2693 unsigned long addr, pmd_t *pmdp, 2694 struct folio *folio) 2695 { 2696 struct mm_struct *mm = vma->vm_mm; 2697 int ref_count, map_count; 2698 pmd_t orig_pmd = *pmdp; 2699 struct page *page; 2700 2701 if (folio_test_dirty(folio) || pmd_dirty(orig_pmd)) 2702 return false; 2703 2704 orig_pmd = pmdp_huge_clear_flush(vma, addr, pmdp); 2705 2706 /* 2707 * Syncing against concurrent GUP-fast: 2708 * - clear PMD; barrier; read refcount 2709 * - inc refcount; barrier; read PMD 2710 */ 2711 smp_mb(); 2712 2713 ref_count = folio_ref_count(folio); 2714 map_count = folio_mapcount(folio); 2715 2716 /* 2717 * Order reads for folio refcount and dirty flag 2718 * (see comments in __remove_mapping()). 2719 */ 2720 smp_rmb(); 2721 2722 /* 2723 * If the folio or its PMD is redirtied at this point, or if there 2724 * are unexpected references, we will give up to discard this folio 2725 * and remap it. 2726 * 2727 * The only folio refs must be one from isolation plus the rmap(s). 2728 */ 2729 if (folio_test_dirty(folio) || pmd_dirty(orig_pmd) || 2730 ref_count != map_count + 1) { 2731 set_pmd_at(mm, addr, pmdp, orig_pmd); 2732 return false; 2733 } 2734 > 2735 folio_remove_rmap_pmd(folio, page, vma); 2736 zap_deposited_table(mm, pmdp); 2737 add_mm_counter(mm, MM_ANONPAGES, -HPAGE_PMD_NR); 2738 if (vma->vm_flags & VM_LOCKED) 2739 mlock_drain_local(); 2740 folio_put(folio); 2741 2742 return true; 2743 } 2744 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
