--- a/src/hotspot/os/linux/os_linux.hpp	Wed Oct 16 14:32:17 2019 -0700
+++ b/src/hotspot/os/linux/os_linux.hpp	Thu Oct 17 00:00:13 2019 +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; }
@@ -196,7 +184,6 @@
 
   // Stack overflow handling
   static bool manually_expand_stack(JavaThread * t, address addr);
-  static int max_register_window_saves_before_flushing();
 
   // fast POSIX clocks support
   static void fast_thread_clock_init(void);
@@ -211,10 +198,6 @@
 
   static jlong fast_thread_cpu_time(clockid_t clockid);
 
-  static void initialize_os_info();
-  static bool os_version_is_known();
-  static uint32_t os_version();
-
   // Stack repair handling
 
   // none present