I need another try ...

Author: GoeLin

src/hotspot/os/linux/os_linux.hpp

@@ -104,6 +104,7 @@ class Linux {
     bool     has_steal_ticks;
   };
 
+  static int active_processor_count();
   // which_logical_cpu=-1 returns accumulated ticks for all cpus.
   static bool get_tick_information(CPUPerfTicks* pticks, int which_logical_cpu);
   static bool _stack_is_executable;