khugepaged: remove meaningless !pte_present() check in khugepaged_sca…

…n_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/[email protected] Signed-off-by: Miaohe Lin <[email protected]> Reviewed-by: Zi Yan <[email protected]> Cc: Mike Kravetz <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
ambv · May 5, 2021 · 75f8378 · 75f8378
1 parent 18d24a7
commit 75f8378
Showing 1 changed file with 0 additions and 4 deletions.
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
@@ -1271,10 +1271,6 @@ static int khugepaged_scan_pmd(struct mm_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