src/hotspot/share/gc/z/zRootsIterator.cpp

@@ -89,11 +89,11 @@
     _iter(iter),
     _claimed(false) {}
 
 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>
 void ZSerialOopsDo<T, F>::oops_do(ZRootsIteratorClosure* cl) {
-  if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
+  if (!_claimed && Atomic::cmpxchg(&_claimed, false, true) == false) {
     (_iter->*F)(cl);
   }
 }
 
 template <typename T, void (T::*F)(ZRootsIteratorClosure*)>

@@ -116,11 +116,11 @@
     _iter(iter),
     _claimed(false) {}
 
 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>
 void ZSerialWeakOopsDo<T, F>::weak_oops_do(BoolObjectClosure* is_alive, ZRootsIteratorClosure* cl) {
-  if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
+  if (!_claimed && Atomic::cmpxchg(&_claimed, false, true) == false) {
     (_iter->*F)(is_alive, cl);
   }
 }
 
 template <typename T, void (T::*F)(BoolObjectClosure*, ZRootsIteratorClosure*)>