diff --git a/fs/dax.c b/fs/dax.c
index f3a44a7..9ec7974 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -614,6 +614,13 @@
 		if (follow_pte_pmd(vma->vm_mm, address, &start, &end, &ptep, &pmdp, &ptl))
 			continue;
 
+		/*
+		 * No need to call mmu_notifier_invalidate_range() as we are
+		 * downgrading page table protection not changing it to point
+		 * to a new page.
+		 *
+		 * See Documentation/vm/mmu_notifier.txt
+		 */
 		if (pmdp) {
 #ifdef CONFIG_FS_DAX_PMD
 			pmd_t pmd;
@@ -628,7 +635,6 @@
 			pmd = pmd_wrprotect(pmd);
 			pmd = pmd_mkclean(pmd);
 			set_pmd_at(vma->vm_mm, address, pmdp, pmd);
-			mmu_notifier_invalidate_range(vma->vm_mm, start, end);
 unlock_pmd:
 			spin_unlock(ptl);
 #endif
@@ -643,7 +649,6 @@
 			pte = pte_wrprotect(pte);
 			pte = pte_mkclean(pte);
 			set_pte_at(vma->vm_mm, address, ptep, pte);
-			mmu_notifier_invalidate_range(vma->vm_mm, start, end);
 unlock_pte:
 			pte_unmap_unlock(ptep, ptl);
 		}