--- a/src/hotspot/share/gc/shared/modRefBarrierSet.inline.hpp	Mon Nov 25 12:32:07 2019 +0100
+++ b/src/hotspot/share/gc/shared/modRefBarrierSet.inline.hpp	Mon Nov 25 12:32:40 2019 +0100
@@ -80,10 +80,10 @@
 template <DecoratorSet decorators, typename BarrierSetT>
 template <typename T>
 inline oop ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
-oop_atomic_xchg_in_heap(oop new_value, T* addr) {
+oop_atomic_xchg_in_heap(T* addr, oop new_value) {
   BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
   bs->template write_ref_field_pre<decorators>(addr);
-  oop result = Raw::oop_atomic_xchg(new_value, addr);
+  oop result = Raw::oop_atomic_xchg(addr, new_value);
   bs->template write_ref_field_post<decorators>(addr, new_value);
   return result;
 }