# HG changeset patch
# User johnc
# Date 1342562222 25200
# Node ID d42fe3c3001d77c7fd9ca7481445b1cd3171a34b
# Parent  594dff5e3c2ea28eb1fc879fd3adb0bea55a5721
7184772: G1: Incorrect assert in HeapRegionLinkedList::add_as_head()
Summary: Assertion incorrectly checks that _head is NULL and should be checking that _tail is NULL instead.
Reviewed-by: johnc
Contributed-by: Brandon Mitchell <brandon@twitter.com>

diff -r 594dff5e3c2e -r d42fe3c3001d src/share/vm/gc_implementation/g1/heapRegionSet.cpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSet.cpp	Tue Jul 17 11:52:10 2012 -0700
+++ b/src/share/vm/gc_implementation/g1/heapRegionSet.cpp	Tue Jul 17 14:57:02 2012 -0700
@@ -292,7 +292,7 @@
     assert(length() >  0 && _tail != NULL, hrs_ext_msg(this, "invariant"));
     from_list->_tail->set_next(_head);
   } else {
-    assert(length() == 0 && _head == NULL, hrs_ext_msg(this, "invariant"));
+    assert(length() == 0 && _tail == NULL, hrs_ext_msg(this, "invariant"));
     _tail = from_list->_tail;
   }
   _head = from_list->_head;