1 files changed, 20 insertions, 0 deletions

diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 438951d366f2..8d032de4088e 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -100,6 +100,26 @@ int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
         return young;
 }
 
+int __mmu_notifier_test_young(struct mm_struct *mm,
+                              unsigned long address)
+{
+        struct mmu_notifier *mn;
+        struct hlist_node *n;
+        int young = 0;
+
+        rcu_read_lock();
+        hlist_for_each_entry_rcu(mn, n, &mm->mmu_notifier_mm->list, hlist) {
+                if (mn->ops->test_young) {
+                        young = mn->ops->test_young(mn, mm, address);
+                        if (young)
+                                break;
+                }
+        }
+        rcu_read_unlock();
+
+        return young;
+}
+
 void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address,
                                pte_t pte)
 {