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mmu_notifier_test_young") introduced > mmu_notifier_test_young(), but we should pass the address need to test. > In xxx_scan_pmd(), the actual iteration address is "_address" not > "address". We seem to misuse the variable on the very beginning. > > Change it to the right one. > > Fixes: 8ee53820edfd ("thp: mmu_notifier_test_young") > Signed-off-by: Wei Yang > Cc: David Hildenbrand > Cc: Lorenzo Stoakes > Cc: Zi Yan > Cc: Baolin Wang > Cc: Liam R. Howlett > Cc: Nico Pache > Cc: Ryan Roberts > Cc: Dev Jain > Cc: Barry Song > CC: > > --- > The original commit 8ee53820edfd is at 2011. > Then the code is moved to khugepaged.c in commit b46e756f5e470 ("thp: > extract khugepaged from mm/huge_memory.c") in 2022. > --- > mm/khugepaged.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index 24e18a7f8a93..b000942250d1 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -1418,7 +1418,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm, > if (cc->is_khugepaged && > (pte_young(pteval) || folio_test_young(folio) || > folio_test_referenced(folio) || mmu_notifier_test_young(vma->vm_mm, > - address))) > + _address))) > referenced++; > } > if (!writable) { > -- > 2.34.1 LGTM. Reviewed-by: Zi Yan -- Best Regards, Yan, Zi