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Message-ID: <202505152339.fBOfDPsi-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 088d13246a4672bc03aec664675138e3f5bff68c commit: a52dcec56c5b96250f15efbd7de3d3ea6ce863d9 mm/mglru: fix PTE-mapped large folios config: sparc-randconfig-r073-20250515 (https://download.01.org/0day-ci/archive/20250515/202505152339.fBOfDPsi-lkp@intel.com/config) compiler: sparc64-linux-gcc (GCC) 8.5.0 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202505152339.fBOfDPsi-lkp@intel.com/ smatch warnings: mm/vmscan.c:3504 walk_pte_range() error: uninitialized symbol 'dirty'. mm/vmscan.c:3595 walk_pmd_range_locked() error: uninitialized symbol 'dirty'. mm/vmscan.c:4215 lru_gen_look_around() error: uninitialized symbol 'dirty'. vim +/dirty +3504 mm/vmscan.c bd74fdaea14602 Yu Zhao 2022-09-18 3450 static bool walk_pte_range(pmd_t *pmd, unsigned long start, unsigned long end, bd74fdaea14602 Yu Zhao 2022-09-18 3451 struct mm_walk *args) bd74fdaea14602 Yu Zhao 2022-09-18 3452 { bd74fdaea14602 Yu Zhao 2022-09-18 3453 int i; a52dcec56c5b96 Yu Zhao 2024-12-30 3454 bool dirty; bd74fdaea14602 Yu Zhao 2022-09-18 3455 pte_t *pte; bd74fdaea14602 Yu Zhao 2022-09-18 3456 spinlock_t *ptl; bd74fdaea14602 Yu Zhao 2022-09-18 3457 unsigned long addr; bd74fdaea14602 Yu Zhao 2022-09-18 3458 int total = 0; bd74fdaea14602 Yu Zhao 2022-09-18 3459 int young = 0; a52dcec56c5b96 Yu Zhao 2024-12-30 3460 struct folio *last = NULL; bd74fdaea14602 Yu Zhao 2022-09-18 3461 struct lru_gen_mm_walk *walk = args->private; bd74fdaea14602 Yu Zhao 2022-09-18 3462 struct mem_cgroup *memcg = lruvec_memcg(walk->lruvec); bd74fdaea14602 Yu Zhao 2022-09-18 3463 struct pglist_data *pgdat = lruvec_pgdat(walk->lruvec); cc25bbe10a86a7 Kinsey Ho 2024-02-14 3464 DEFINE_MAX_SEQ(walk->lruvec); a52dcec56c5b96 Yu Zhao 2024-12-30 3465 int gen = lru_gen_from_seq(max_seq); 2441774f2d2890 Qi Zheng 2024-09-26 3466 pmd_t pmdval; bd74fdaea14602 Yu Zhao 2022-09-18 3467 a52dcec56c5b96 Yu Zhao 2024-12-30 3468 pte = pte_offset_map_rw_nolock(args->mm, pmd, start & PMD_MASK, &pmdval, &ptl); 52fc048320adf1 Hugh Dickins 2023-06-08 3469 if (!pte) 52fc048320adf1 Hugh Dickins 2023-06-08 3470 return false; a52dcec56c5b96 Yu Zhao 2024-12-30 3471 52fc048320adf1 Hugh Dickins 2023-06-08 3472 if (!spin_trylock(ptl)) { 52fc048320adf1 Hugh Dickins 2023-06-08 3473 pte_unmap(pte); a52dcec56c5b96 Yu Zhao 2024-12-30 3474 return true; 52fc048320adf1 Hugh Dickins 2023-06-08 3475 } bd74fdaea14602 Yu Zhao 2022-09-18 3476 2441774f2d2890 Qi Zheng 2024-09-26 3477 if (unlikely(!pmd_same(pmdval, pmdp_get_lockless(pmd)))) { 2441774f2d2890 Qi Zheng 2024-09-26 3478 pte_unmap_unlock(pte, ptl); 2441774f2d2890 Qi Zheng 2024-09-26 3479 return false; 2441774f2d2890 Qi Zheng 2024-09-26 3480 } 2441774f2d2890 Qi Zheng 2024-09-26 3481 bd74fdaea14602 Yu Zhao 2022-09-18 3482 arch_enter_lazy_mmu_mode(); bd74fdaea14602 Yu Zhao 2022-09-18 3483 restart: bd74fdaea14602 Yu Zhao 2022-09-18 3484 for (i = pte_index(start), addr = start; addr != end; i++, addr += PAGE_SIZE) { bd74fdaea14602 Yu Zhao 2022-09-18 3485 unsigned long pfn; bd74fdaea14602 Yu Zhao 2022-09-18 3486 struct folio *folio; c33c794828f212 Ryan Roberts 2023-06-12 3487 pte_t ptent = ptep_get(pte + i); bd74fdaea14602 Yu Zhao 2022-09-18 3488 bd74fdaea14602 Yu Zhao 2022-09-18 3489 total++; bd74fdaea14602 Yu Zhao 2022-09-18 3490 walk->mm_stats[MM_LEAF_TOTAL]++; bd74fdaea14602 Yu Zhao 2022-09-18 3491 1d4832becdc2cd Yu Zhao 2024-10-19 3492 pfn = get_pte_pfn(ptent, args->vma, addr, pgdat); bd74fdaea14602 Yu Zhao 2022-09-18 3493 if (pfn == -1) bd74fdaea14602 Yu Zhao 2022-09-18 3494 continue; bd74fdaea14602 Yu Zhao 2022-09-18 3495 798c0330c2ca07 Yu Zhao 2024-12-30 3496 folio = get_pfn_folio(pfn, memcg, pgdat); bd74fdaea14602 Yu Zhao 2022-09-18 3497 if (!folio) bd74fdaea14602 Yu Zhao 2022-09-18 3498 continue; bd74fdaea14602 Yu Zhao 2022-09-18 3499 1d4832becdc2cd Yu Zhao 2024-10-19 3500 if (!ptep_clear_young_notify(args->vma, addr, pte + i)) 1d4832becdc2cd Yu Zhao 2024-10-19 3501 continue; bd74fdaea14602 Yu Zhao 2022-09-18 3502 a52dcec56c5b96 Yu Zhao 2024-12-30 3503 if (last != folio) { a52dcec56c5b96 Yu Zhao 2024-12-30 @3504 walk_update_folio(walk, last, gen, dirty); ^^^^^ Potentially uninitialized. It's weird that I didn't report this in Jan because it seems like a reasonable warning. Sorry for that. bd74fdaea14602 Yu Zhao 2022-09-18 3505 a52dcec56c5b96 Yu Zhao 2024-12-30 3506 last = folio; a52dcec56c5b96 Yu Zhao 2024-12-30 3507 dirty = false; a52dcec56c5b96 Yu Zhao 2024-12-30 3508 } bd74fdaea14602 Yu Zhao 2022-09-18 3509 a52dcec56c5b96 Yu Zhao 2024-12-30 3510 if (pte_dirty(ptent)) a52dcec56c5b96 Yu Zhao 2024-12-30 3511 dirty = true; a52dcec56c5b96 Yu Zhao 2024-12-30 3512 a52dcec56c5b96 Yu Zhao 2024-12-30 3513 young++; a52dcec56c5b96 Yu Zhao 2024-12-30 3514 walk->mm_stats[MM_LEAF_YOUNG]++; bd74fdaea14602 Yu Zhao 2022-09-18 3515 } bd74fdaea14602 Yu Zhao 2022-09-18 3516 a52dcec56c5b96 Yu Zhao 2024-12-30 3517 walk_update_folio(walk, last, gen, dirty); a52dcec56c5b96 Yu Zhao 2024-12-30 3518 last = NULL; a52dcec56c5b96 Yu Zhao 2024-12-30 3519 bd74fdaea14602 Yu Zhao 2022-09-18 3520 if (i < PTRS_PER_PTE && get_next_vma(PMD_MASK, PAGE_SIZE, args, &start, &end)) bd74fdaea14602 Yu Zhao 2022-09-18 3521 goto restart; bd74fdaea14602 Yu Zhao 2022-09-18 3522 bd74fdaea14602 Yu Zhao 2022-09-18 3523 arch_leave_lazy_mmu_mode(); 52fc048320adf1 Hugh Dickins 2023-06-08 3524 pte_unmap_unlock(pte, ptl); bd74fdaea14602 Yu Zhao 2022-09-18 3525 bd74fdaea14602 Yu Zhao 2022-09-18 3526 return suitable_to_scan(total, young); bd74fdaea14602 Yu Zhao 2022-09-18 3527 } bd74fdaea14602 Yu Zhao 2022-09-18 3528 b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3529 static void walk_pmd_range_locked(pud_t *pud, unsigned long addr, struct vm_area_struct *vma, b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3530 struct mm_walk *args, unsigned long *bitmap, unsigned long *first) bd74fdaea14602 Yu Zhao 2022-09-18 3531 { bd74fdaea14602 Yu Zhao 2022-09-18 3532 int i; a52dcec56c5b96 Yu Zhao 2024-12-30 3533 bool dirty; bd74fdaea14602 Yu Zhao 2022-09-18 3534 pmd_t *pmd; bd74fdaea14602 Yu Zhao 2022-09-18 3535 spinlock_t *ptl; a52dcec56c5b96 Yu Zhao 2024-12-30 3536 struct folio *last = NULL; bd74fdaea14602 Yu Zhao 2022-09-18 3537 struct lru_gen_mm_walk *walk = args->private; bd74fdaea14602 Yu Zhao 2022-09-18 3538 struct mem_cgroup *memcg = lruvec_memcg(walk->lruvec); bd74fdaea14602 Yu Zhao 2022-09-18 3539 struct pglist_data *pgdat = lruvec_pgdat(walk->lruvec); cc25bbe10a86a7 Kinsey Ho 2024-02-14 3540 DEFINE_MAX_SEQ(walk->lruvec); a52dcec56c5b96 Yu Zhao 2024-12-30 3541 int gen = lru_gen_from_seq(max_seq); bd74fdaea14602 Yu Zhao 2022-09-18 3542 bd74fdaea14602 Yu Zhao 2022-09-18 3543 VM_WARN_ON_ONCE(pud_leaf(*pud)); bd74fdaea14602 Yu Zhao 2022-09-18 3544 bd74fdaea14602 Yu Zhao 2022-09-18 3545 /* try to batch at most 1+MIN_LRU_BATCH+1 entries */ b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3546 if (*first == -1) { b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3547 *first = addr; b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3548 bitmap_zero(bitmap, MIN_LRU_BATCH); bd74fdaea14602 Yu Zhao 2022-09-18 3549 return; bd74fdaea14602 Yu Zhao 2022-09-18 3550 } bd74fdaea14602 Yu Zhao 2022-09-18 3551 b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3552 i = addr == -1 ? 0 : pmd_index(addr) - pmd_index(*first); bd74fdaea14602 Yu Zhao 2022-09-18 3553 if (i && i <= MIN_LRU_BATCH) { bd74fdaea14602 Yu Zhao 2022-09-18 3554 __set_bit(i - 1, bitmap); bd74fdaea14602 Yu Zhao 2022-09-18 3555 return; bd74fdaea14602 Yu Zhao 2022-09-18 3556 } bd74fdaea14602 Yu Zhao 2022-09-18 3557 b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3558 pmd = pmd_offset(pud, *first); bd74fdaea14602 Yu Zhao 2022-09-18 3559 bd74fdaea14602 Yu Zhao 2022-09-18 3560 ptl = pmd_lockptr(args->mm, pmd); bd74fdaea14602 Yu Zhao 2022-09-18 3561 if (!spin_trylock(ptl)) bd74fdaea14602 Yu Zhao 2022-09-18 3562 goto done; bd74fdaea14602 Yu Zhao 2022-09-18 3563 bd74fdaea14602 Yu Zhao 2022-09-18 3564 arch_enter_lazy_mmu_mode(); bd74fdaea14602 Yu Zhao 2022-09-18 3565 bd74fdaea14602 Yu Zhao 2022-09-18 3566 do { bd74fdaea14602 Yu Zhao 2022-09-18 3567 unsigned long pfn; bd74fdaea14602 Yu Zhao 2022-09-18 3568 struct folio *folio; b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3569 b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3570 /* don't round down the first address */ b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3571 addr = i ? (*first & PMD_MASK) + i * PMD_SIZE : *first; bd74fdaea14602 Yu Zhao 2022-09-18 3572 1d4832becdc2cd Yu Zhao 2024-10-19 3573 if (!pmd_present(pmd[i])) bd74fdaea14602 Yu Zhao 2022-09-18 3574 goto next; bd74fdaea14602 Yu Zhao 2022-09-18 3575 bd74fdaea14602 Yu Zhao 2022-09-18 3576 if (!pmd_trans_huge(pmd[i])) { 1d4832becdc2cd Yu Zhao 2024-10-19 3577 if (!walk->force_scan && should_clear_pmd_young() && 1d4832becdc2cd Yu Zhao 2024-10-19 3578 !mm_has_notifiers(args->mm)) bd74fdaea14602 Yu Zhao 2022-09-18 3579 pmdp_test_and_clear_young(vma, addr, pmd + i); bd74fdaea14602 Yu Zhao 2022-09-18 3580 goto next; bd74fdaea14602 Yu Zhao 2022-09-18 3581 } bd74fdaea14602 Yu Zhao 2022-09-18 3582 1d4832becdc2cd Yu Zhao 2024-10-19 3583 pfn = get_pmd_pfn(pmd[i], vma, addr, pgdat); 1d4832becdc2cd Yu Zhao 2024-10-19 3584 if (pfn == -1) 1d4832becdc2cd Yu Zhao 2024-10-19 3585 goto next; 1d4832becdc2cd Yu Zhao 2024-10-19 3586 798c0330c2ca07 Yu Zhao 2024-12-30 3587 folio = get_pfn_folio(pfn, memcg, pgdat); bd74fdaea14602 Yu Zhao 2022-09-18 3588 if (!folio) bd74fdaea14602 Yu Zhao 2022-09-18 3589 goto next; bd74fdaea14602 Yu Zhao 2022-09-18 3590 1d4832becdc2cd Yu Zhao 2024-10-19 3591 if (!pmdp_clear_young_notify(vma, addr, pmd + i)) bd74fdaea14602 Yu Zhao 2022-09-18 3592 goto next; bd74fdaea14602 Yu Zhao 2022-09-18 3593 a52dcec56c5b96 Yu Zhao 2024-12-30 3594 if (last != folio) { a52dcec56c5b96 Yu Zhao 2024-12-30 @3595 walk_update_folio(walk, last, gen, dirty); Same. bd74fdaea14602 Yu Zhao 2022-09-18 3596 a52dcec56c5b96 Yu Zhao 2024-12-30 3597 last = folio; a52dcec56c5b96 Yu Zhao 2024-12-30 3598 dirty = false; a52dcec56c5b96 Yu Zhao 2024-12-30 3599 } bd74fdaea14602 Yu Zhao 2022-09-18 3600 a52dcec56c5b96 Yu Zhao 2024-12-30 3601 if (pmd_dirty(pmd[i])) a52dcec56c5b96 Yu Zhao 2024-12-30 3602 dirty = true; a52dcec56c5b96 Yu Zhao 2024-12-30 3603 a52dcec56c5b96 Yu Zhao 2024-12-30 3604 walk->mm_stats[MM_LEAF_YOUNG]++; bd74fdaea14602 Yu Zhao 2022-09-18 3605 next: bd74fdaea14602 Yu Zhao 2022-09-18 3606 i = i > MIN_LRU_BATCH ? 0 : find_next_bit(bitmap, MIN_LRU_BATCH, i) + 1; bd74fdaea14602 Yu Zhao 2022-09-18 3607 } while (i <= MIN_LRU_BATCH); bd74fdaea14602 Yu Zhao 2022-09-18 3608 a52dcec56c5b96 Yu Zhao 2024-12-30 3609 walk_update_folio(walk, last, gen, dirty); a52dcec56c5b96 Yu Zhao 2024-12-30 3610 bd74fdaea14602 Yu Zhao 2022-09-18 3611 arch_leave_lazy_mmu_mode(); bd74fdaea14602 Yu Zhao 2022-09-18 3612 spin_unlock(ptl); bd74fdaea14602 Yu Zhao 2022-09-18 3613 done: b5ff4133617d0e T.J. Alumbaugh 2023-01-18 3614 *first = -1; bd74fdaea14602 Yu Zhao 2022-09-18 3615 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki