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diff --git openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegion.cpp openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegion.cpp
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--- openjdk.orig/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegion.cpp
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+++ openjdk/hotspot/src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegion.cpp
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@@ -524,8 +524,8 @@
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     region_size = max_heap_size / ShenandoahTargetNumRegions;
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     // Now make sure that we don't go over or under our limits.
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-    region_size = MAX2(ShenandoahMinRegionSize, region_size);
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-    region_size = MIN2(ShenandoahMaxRegionSize, region_size);
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+    region_size = MAX2<size_t>(ShenandoahMinRegionSize, region_size);
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+    region_size = MIN2<size_t>(ShenandoahMaxRegionSize, region_size);
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   } else {
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     if (ShenandoahHeapRegionSize > initial_heap_size / MIN_NUM_REGIONS) {