--- old/src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp	2014-09-04 12:38:25.326027918 +0400
+++ new/src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp	2014-09-04 12:38:25.234025057 +0400
@@ -563,3 +563,8 @@
   assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
 }
 #endif
+
+void os::extra_bang_size_in_bytes() {
+  // PPC does not require the additional stack bang.
+  return 0;
+}