diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 5cb8bc7..9595278 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -236,6 +236,19 @@
 }
 
 /*
+ * Return the page size being used by the MMU to back a VMA. In the majority
+ * of cases, the page size used by the kernel matches the MMU size. On
+ * architectures where it differs, an architecture-specific version of this
+ * function is required.
+ */
+#ifndef vma_mmu_pagesize
+unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
+{
+	return vma_kernel_pagesize(vma);
+}
+#endif
+
+/*
  * Flags for MAP_PRIVATE reservations.  These are stored in the bottom
  * bits of the reservation map pointer, which are always clear due to
  * alignment.