Index: kernel/generic/include/mm/as.h
===================================================================
--- kernel/generic/include/mm/as.h	(revision 630a8ef8b9f6c67b514695eff2ebd9d546564951)
+++ kernel/generic/include/mm/as.h	(revision 03523dc1a1b995f38890ce6c9acd331895521f09)
@@ -231,7 +231,11 @@
 /** Address space area backend structure. */
 typedef struct mem_backend {
+	bool (* create)(as_area_t *);
+	bool (* resize)(as_area_t *, size_t);
+	void (* share)(as_area_t *);
+	void (* destroy)(as_area_t *);
+
 	int (* page_fault)(as_area_t *, uintptr_t, pf_access_t);
 	void (* frame_free)(as_area_t *, uintptr_t, uintptr_t);
-	void (* share)(as_area_t *);
 } mem_backend_t;