diff options
Diffstat (limited to 'mm/page_idle.c')
| -rw-r--r-- | mm/page_idle.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/page_idle.c b/mm/page_idle.c index 947c7c7a3728..408aaf29a3ea 100644 --- a/mm/page_idle.c +++ b/mm/page_idle.c @@ -62,9 +62,14 @@ static bool page_idle_clear_pte_refs_one(struct folio *folio, /* * For PTE-mapped THP, one sub page is referenced, * the whole THP is referenced. + * + * PFN swap PTEs, such as device-exclusive ones, that + * actually map pages are "old" from a CPU perspective. + * The MMU notifier takes care of any device aspects. */ - if (ptep_clear_young_notify(vma, addr, pvmw.pte)) - referenced = true; + if (likely(pte_present(ptep_get(pvmw.pte)))) + referenced |= ptep_test_and_clear_young(vma, addr, pvmw.pte); + referenced |= mmu_notifier_clear_young(vma->vm_mm, addr, addr + PAGE_SIZE); } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { if (pmdp_clear_young_notify(vma, addr, pvmw.pmd)) referenced = true; |