re #13613 rb4516 Tunables needs volatile keyword

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   * Copyright 2015 Joyent, Inc.
   */
  
  #include <sys/types.h>
  #include <sys/param.h>
*** 155,166 ****
   * anon allocations will fail.
   *
   * There is also a per mount limit on the amount of swap space
   * (tmount.tm_anonmax) settable via a mount option.
   */
! size_t tmpfs_maxkmem = 0;
! size_t tmpfs_minfree = 0;
  size_t tmp_kmemspace;           /* bytes of kernel heap used by all tmpfs */
  
  static major_t tmpfs_major;
  static minor_t tmpfs_minor;
  static kmutex_t tmpfs_minor_lock;
--- 156,167 ----
   * anon allocations will fail.
   *
   * There is also a per mount limit on the amount of swap space
   * (tmount.tm_anonmax) settable via a mount option.
   */
! volatile size_t tmpfs_maxkmem = 0;
! volatile size_t tmpfs_minfree = 0;
  size_t tmp_kmemspace;           /* bytes of kernel heap used by all tmpfs */
  
  static major_t tmpfs_major;
  static minor_t tmpfs_minor;
  static kmutex_t tmpfs_minor_lock;