From d8f7e51f7ecfd5dfffe50b726bd71461c4b08835 Mon Sep 17 00:00:00 2001
From: Xiaolong Peng <xlpeng@amazon.com>
Date: Fri, 16 Jan 2026 01:16:03 -0800
Subject: [PATCH] Load _volatile_top once in free_bytes_for_atomic_alloc

---
 src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp b/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp
index 6607d8f8777..f4a9a0f66eb 100644
--- a/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp
@@ -483,7 +483,7 @@ public:
   size_t free_words() const     { return pointer_delta(end(), top()); }
   size_t free_bytes_for_atomic_alloc() const {
     HeapWord* v_top = volatile_top();
-    return v_top == nullptr ? 0 : byte_size(volatile_top(),    end());
+    return v_top == nullptr ? 0 : byte_size(v_top,    end());
   }
 
   // Does this region contain this address?