re #13613 rb4516 Tunables needs volatile keyword

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   */
  
  /*
   * UNIX machine dependent virtual memory support.
   */
*** 572,582 ****
  extern int ecache_alignsize;
  #define L2CACHE_ALIGN           ecache_alignsize
  #define L2CACHE_ALIGN_MAX       512
  
  extern int update_proc_pgcolorbase_after_fork;
! extern int consistent_coloring;
  extern uint_t vac_colors_mask;
  extern int vac_size;
  extern int vac_shift;
  
  /*
--- 573,583 ----
  extern int ecache_alignsize;
  #define L2CACHE_ALIGN           ecache_alignsize
  #define L2CACHE_ALIGN_MAX       512
  
  extern int update_proc_pgcolorbase_after_fork;
! extern volatile int consistent_coloring;
  extern uint_t vac_colors_mask;
  extern int vac_size;
  extern int vac_shift;
  
  /*