Index: kernel/generic/include/mm/frame.h
===================================================================
--- kernel/generic/include/mm/frame.h	(revision e6a6c02954a45ba875ec2de8c72742d0183240e7)
+++ kernel/generic/include/mm/frame.h	(revision c6f1908ecbced40d641beac151a51af7725f49d0)
@@ -163,4 +163,5 @@
 extern void frame_mark_unavailable(pfn_t, size_t);
 extern size_t zone_conf_size(size_t);
+extern pfn_t zone_external_conf_alloc(size_t);
 extern bool zone_merge(size_t, size_t);
 extern void zone_merge_all(void);