Index: kernel/generic/src/mm/backend_phys.c
===================================================================
--- kernel/generic/src/mm/backend_phys.c	(revision d1582b502edcb7bfeef771a2019538f265e7e27c)
+++ kernel/generic/src/mm/backend_phys.c	(revision 8fb674bf23f163e488d9f574fd372f15eacb9f21)
@@ -38,4 +38,5 @@
 
 #include <assert.h>
+#include <ddi/ddi.h>
 #include <typedefs.h>
 #include <mm/as.h>
@@ -101,8 +102,11 @@
 {
 	/*
-	 * Nothing to do.
 	 * The anonymous frames, if any, are released in
 	 * phys_destroy_shared_data().
 	 */
+
+	/* Notify parea has been unmapped */
+	if (area->backend_data.parea != NULL)
+		ddi_parea_unmap_notify(area->backend_data.parea);
 }