re #13613 rb4516 Tunables needs volatile keyword

*** 19,28 ****
--- 19,29 ----
   * CDDL HEADER END
   */
  
  /*
   * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   * Copyright (c) 2013, Joyent, Inc.  All rights reserved.
   */
  
  #include <sys/types.h>
  #include <sys/param.h>
*** 118,129 ****
  #define MIN_STKSIZE     DEFAULTSTKSZ
  
  /*
   * default_stksize overrides lwp_default_stksize if it is set.
   */
! int     default_stksize;
! int     lwp_default_stksize;
  
  static zone_key_t zone_thread_key;
  
  unsigned int kmem_stackinfo;            /* stackinfo feature on-off */
  kmem_stkinfo_t *kmem_stkinfo_log;       /* stackinfo circular log */
--- 119,130 ----
  #define MIN_STKSIZE     DEFAULTSTKSZ
  
  /*
   * default_stksize overrides lwp_default_stksize if it is set.
   */
! volatile int    default_stksize;
! volatile int    lwp_default_stksize;
  
  static zone_key_t zone_thread_key;
  
  unsigned int kmem_stackinfo;            /* stackinfo feature on-off */
  kmem_stkinfo_t *kmem_stkinfo_log;       /* stackinfo circular log */