--- old/src/hotspot/share/gc/g1/g1HotCardCache.cpp	2019-11-21 11:55:00.552789828 +0100
+++ new/src/hotspot/share/gc/g1/g1HotCardCache.cpp	2019-11-21 11:55:00.300785567 +0100
@@ -78,9 +78,9 @@
   // card_ptr in favor of the other option, which would be starting over. This
   // should be OK since card_ptr will likely be the older card already when/if
   // this ever happens.
-  CardValue* previous_ptr = Atomic::cmpxchg(card_ptr,
-                                            &_hot_cache[masked_index],
-                                            current_ptr);
+  CardValue* previous_ptr = Atomic::cmpxchg(&_hot_cache[masked_index],
+                                            current_ptr,
+                                            card_ptr);
   return (previous_ptr == current_ptr) ? previous_ptr : card_ptr;
 }