--- old/src/hotspot/cpu/ppc/globalDefinitions_ppc.hpp	2017-12-28 18:15:44.305762000 +0100
+++ new/src/hotspot/cpu/ppc/globalDefinitions_ppc.hpp	2017-12-28 18:15:44.089726000 +0100
@@ -55,5 +55,6 @@
 #define SUPPORT_RESERVED_STACK_AREA
 
 #define THREAD_LOCAL_POLL
+#define USE_POLL_BIT_ONLY UseSIGTRAP
 
 #endif // CPU_PPC_VM_GLOBALDEFINITIONS_PPC_HPP