From 0d2f7f6216f2cf6b8cd18d8e0d51a1458097784f Mon Sep 17 00:00:00 2001
From: Leo Korinth <lkorinth@openjdk.org>
Date: Mon, 9 Mar 2026 15:57:33 +0000
Subject: [PATCH] 8377995: ZGC: Fix implicit narrowing conversion in zBitField

Reviewed-by: stefank, aboldtch
---
 src/hotspot/share/gc/z/zBitField.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/hotspot/share/gc/z/zBitField.hpp b/src/hotspot/share/gc/z/zBitField.hpp
index 9bec4e05594..b68f5b92ce1 100644
--- a/src/hotspot/share/gc/z/zBitField.hpp
+++ b/src/hotspot/share/gc/z/zBitField.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -74,7 +74,7 @@ public:
 
   static ContainerType encode(ValueType value) {
     assert(((ContainerType)value & (FieldMask << ValueShift)) == (ContainerType)value, "Invalid value");
-    return ((ContainerType)value >> ValueShift) << FieldShift;
+    return checked_cast<ContainerType>(((ContainerType)value >> ValueShift) << FieldShift);
   }
 };