--- a/src/hotspot/share/gc/z/zPage.inline.hpp	Mon Mar 18 11:50:40 2019 +0100
+++ b/src/hotspot/share/gc/z/zPage.inline.hpp	Mon Mar 18 11:50:40 2019 +0100
@@ -165,10 +165,6 @@
   return is_active() && _seqnum < ZGlobalSeqNum;
 }
 
-inline bool ZPage::is_detached() const {
-  return _physical.is_null();
-}
-
 inline bool ZPage::is_mapped() const {
   return _seqnum > 0;
 }