--- old/src/hotspot/os/linux/os_linux.hpp	2019-10-15 16:03:09.782970549 +0200
+++ new/src/hotspot/os/linux/os_linux.hpp	2019-10-15 16:03:09.370968506 +0200
@@ -55,20 +55,10 @@
   static GrowableArray<int>* _cpu_to_node;
   static GrowableArray<int>* _nindex_to_node;
 
-  // 0x00000000 = uninitialized,
-  // 0x01000000 = kernel version unknown,
-  // otherwise a 32-bit number:
-  // Ox00AABBCC
-  // AA, Major Version
-  // BB, Minor Version
-  // CC, Fix   Version
-  static uint32_t _os_version;
-
  protected:
 
   static julong _physical_memory;
   static pthread_t _main_thread;
-  static Mutex* _createThread_lock;
   static int _page_size;
 
   static julong available_memory();
@@ -136,8 +126,6 @@
   // returns kernel thread id (similar to LWP id on Solaris), which can be
   // used to access /proc
   static pid_t gettid();
-  static void set_createThread_lock(Mutex* lk)                      { _createThread_lock = lk; }
-  static Mutex* createThread_lock(void)                             { return _createThread_lock; }
   static void hotspot_sigmask(Thread* thread);
 
   static address   initial_thread_stack_bottom(void)                { return _initial_thread_stack_bottom; }
@@ -210,9 +198,6 @@
 
   static jlong fast_thread_cpu_time(clockid_t clockid);
 
-  static void initialize_os_info();
-  static uint32_t os_version();
-
   // Stack repair handling
 
   // none present