1 files changed, 5 insertions, 3 deletions
diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h
index b20a9226e0..145afd03e7 100644
--- a/include/qapi/visitor-impl.h
+++ b/include/qapi/visitor-impl.h
@@ -49,11 +49,13 @@ struct Visitor
     /* Must be set to visit structs */
     void (*end_struct)(Visitor *v);
 
-    /* Must be set */
-    void (*start_list)(Visitor *v, const char *name, Error **errp);
+    /* Must be set; implementations may require @list to be non-null,
+     * but must document it. */
+    void (*start_list)(Visitor *v, const char *name, GenericList **list,
+                       size_t size, Error **errp);
 
     /* Must be set */
-    GenericList *(*next_list)(Visitor *v, GenericList **list, size_t size);
+    GenericList *(*next_list)(Visitor *v, GenericList *tail, size_t size);
 
     /* Must be set */
     void (*end_list)(Visitor *v);