--- old/src/share/vm/gc/g1/g1ConcurrentMark.cpp	2017-03-08 10:51:31.253191120 +0100
+++ new/src/share/vm/gc/g1/g1ConcurrentMark.cpp	2017-03-08 10:51:31.139187743 +0100
@@ -2408,11 +2408,11 @@
   size_t n = 0;
   G1TaskQueueEntry task_entry;
   while (n < G1CMMarkStack::EntriesPerChunk && _task_queue->pop_local(task_entry)) {
-    buffer[n] = task_entry;
+    buffer[n].assign(task_entry);
     ++n;
   }
   if (n < G1CMMarkStack::EntriesPerChunk) {
-    buffer[n] = G1TaskQueueEntry();
+    buffer[n].assign(G1TaskQueueEntry());
   }
 
   if (n > 0) {
--- old/src/share/vm/gc/g1/g1ConcurrentMark.hpp	2017-03-08 10:51:31.651202910 +0100
+++ new/src/share/vm/gc/g1/g1ConcurrentMark.hpp	2017-03-08 10:51:31.533199414 +0100
@@ -39,12 +39,6 @@
 class G1OldTracer;
 class G1SurvivorRegions;
 
-#ifdef _MSC_VER
-#pragma warning(push)
-// warning C4522: multiple assignment operators specified
-#pragma warning(disable:4522)
-#endif
-
 // This is a container class for either an oop or a continuation address for
 // mark stack entries. Both are pushed onto the mark stack.
 class G1TaskQueueEntry VALUE_OBJ_CLASS_SPEC {
@@ -64,9 +58,8 @@
   static G1TaskQueueEntry from_slice(HeapWord* what) { return G1TaskQueueEntry(what); }
   static G1TaskQueueEntry from_oop(oop obj) { return G1TaskQueueEntry(obj); }
 
-  G1TaskQueueEntry& operator=(const G1TaskQueueEntry& t) {
+  void assign(const G1TaskQueueEntry& t) {
     _holder = t._holder;
-    return *this;
   }
 
   volatile G1TaskQueueEntry& operator=(const volatile G1TaskQueueEntry& t) volatile {
@@ -89,10 +82,6 @@
   bool is_null() const { return _holder == NULL; }
 };
 
-#ifdef _MSC_VER
-#pragma warning(pop)
-#endif
-
 typedef GenericTaskQueue<G1TaskQueueEntry, mtGC> G1CMTaskQueue;
 typedef GenericTaskQueueSet<G1CMTaskQueue, mtGC> G1CMTaskQueueSet;