re #13613 rb4516 Tunables needs volatile keyword

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1986, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   */
  
  /*
   *      Copyright (c) 1983,1984,1985,1986,1987,1988,1989  AT&T.
   *      All rights reserved.
*** 998,1012 ****
                  zone_rele(mntzone);
  
          return (error);
  }
  
! static int nfs3_dynamic = 0;    /* global variable to enable dynamic retrans. */
! static ushort_t nfs3_max_threads = 8;   /* max number of active async threads */
! uint_t nfs3_bsize = 32 * 1024;  /* client `block' size */
! static uint_t nfs3_async_clusters = 1;  /* # of reqs from each async queue */
! static uint_t nfs3_cots_timeo = NFS_COTS_TIMEO;
  
  static int
  nfs3rootvp(vnode_t **rtvpp, vfs_t *vfsp, struct servinfo *svp,
          int flags, cred_t *cr, zone_t *zone)
  {
--- 999,1013 ----
                  zone_rele(mntzone);
  
          return (error);
  }
  
! volatile int nfs3_dynamic = 0;  /* global variable to enable dynamic retrans. */
! volatile ushort_t nfs3_max_threads = 8; /* max number of active async threads */
! volatile uint_t nfs3_bsize = 32 * 1024; /* client `block' size */
! volatile uint_t nfs3_async_clusters = 1; /* # of reqs from each async queue */
! volatile uint_t nfs3_cots_timeo = NFS_COTS_TIMEO;
  
  static int
  nfs3rootvp(vnode_t **rtvpp, vfs_t *vfsp, struct servinfo *svp,
          int flags, cred_t *cr, zone_t *zone)
  {