--- old/src/hotspot/share/runtime/arguments.cpp	2018-10-05 11:11:24.295987700 -0700
+++ new/src/hotspot/share/runtime/arguments.cpp	2018-10-05 11:11:23.448935300 -0700
@@ -2068,6 +2068,19 @@
       log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
     }
   }
+
+  if(!FLAG_IS_DEFAULT(AllocateHeapAt) && !FLAG_IS_DEFAULT(AllocateOldGenAt)) {
+    jio_fprintf(defaultStream::error_stream(),
+                "AllocateHeapAt and AllocateOldGenAt cannot be used together.\n");
+    status = false;
+  }
+
+  if (!FLAG_IS_DEFAULT(AllocateOldGenAt) && (UseSerialGC || UseConcMarkSweepGC || UseEpsilonGC || UseZGC)) {
+    jio_fprintf(defaultStream::error_stream(),
+      "AllocateOldGenAt not supported for selected GC.\n");
+    status = false;
+  }
+
   return status;
 }