diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 0379956fff23..b6c004bd9f6a 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -259,6 +259,8 @@ extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r,
 				  bool only_end);
 extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
 				  unsigned long start, unsigned long end);
+extern bool
+mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range);
 
 static inline bool
 mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
@@ -568,6 +570,8 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
 {
 }
 
+#define mmu_notifier_range_update_to_read_only(r) false
+
 #define ptep_clear_flush_young_notify ptep_clear_flush_young
 #define pmdp_clear_flush_young_notify pmdp_clear_flush_young
 #define ptep_clear_young_notify ptep_test_and_clear_young
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index abd88c466eb2..ee36068077b6 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -395,3 +395,13 @@ void mmu_notifier_unregister_no_release(struct mmu_notifier *mn,
 	mmdrop(mm);
 }
 EXPORT_SYMBOL_GPL(mmu_notifier_unregister_no_release);
+
+bool
+mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range)
+{
+	if (!range->vma || range->event != MMU_NOTIFY_PROTECTION_VMA)
+		return false;
+	/* Return true if the vma still have the read flag set. */
+	return range->vma->vm_flags & VM_READ;
+}
+EXPORT_SYMBOL_GPL(mmu_notifier_range_update_to_read_only);