diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 9b3db11a4d1d..908ec1577f40 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -479,7 +479,15 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
 	return err;
 }
 
-/*
+/**
+ * walk_page_range_novma - walk a range of pagetables not backed by a vma
+ * @mm:		mm_struct representing the target process of page table walk
+ * @start:	start address of the virtual address range
+ * @end:	end address of the virtual address range
+ * @ops:	operation to call during the walk
+ * @pgd:	pgd to walk if different from mm->pgd
+ * @private:	private data for callbacks' usage
+ *
  * Similar to walk_page_range() but can walk any page tables even if they are
  * not backed by VMAs. Because 'unusual' entries may be walked this function
  * will also not lock the PTEs for the pte_entry() callback. This is useful for