From: Miaohe Lin <linmiaohe@xxxxxxxxxx> Subject: khugepaged: remove meaningless !pte_present() check in khugepaged_scan_pmd() We know it must meet the !is_swap_pte() and !pte_none() condition if we reach here. Since !is_swap_pte() indicates pte_none() or pte_present() is met, it's guaranteed that pte must be present here. Link: https://lkml.kernel.org/r/20210325135647.64106-4-linmiaohe@xxxxxxxxxx Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/khugepaged.c | 4 ---- 1 file changed, 4 deletions(-) --- a/mm/khugepaged.c~khugepaged-remove-meaningless-pte_present-check-in-khugepaged_scan_pmd +++ a/mm/khugepaged.c @@ -1271,10 +1271,6 @@ static int khugepaged_scan_pmd(struct mm goto out_unmap; } } - if (!pte_present(pteval)) { - result = SCAN_PTE_NON_PRESENT; - goto out_unmap; - } if (pte_uffd_wp(pteval)) { /* * Don't collapse the page if any of the small _
