re #13613 rb4516 Tunables needs volatile keyword

*** 19,36 ****
--- 19,38 ----
   * CDDL HEADER END
   */
  
  /*
   * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   */
  
  #include <sys/types.h>
  #include <sys/strlog.h>
  #include <sys/policy.h>
  #include <sys/strsun.h>
  #include <sys/squeue_impl.h>
  #include <sys/squeue.h>
+ #include <sys/vmsystm.h>
  
  #include <inet/common.h>
  #include <inet/ip.h>
  #include <inet/tcp.h>
  #include <inet/tcp_impl.h>
*** 502,512 ****
  tcp_reclaim_timer(void *arg)
  {
          tcp_stack_t *tcps = (tcp_stack_t *)arg;
          int64_t tot_conn = 0;
          int i;
-         extern pgcnt_t lotsfree, needfree;
  
          for (i = 0; i < tcps->tcps_sc_cnt; i++)
                  tot_conn += tcps->tcps_sc[i]->tcp_sc_conn_cnt;
  
          /*
--- 504,513 ----
*** 544,554 ****
  tcp_conn_reclaim(void *arg)
  {
          netstack_handle_t nh;
          netstack_t *ns;
          tcp_stack_t *tcps;
-         extern pgcnt_t lotsfree, needfree;
  
          if (!tcp_do_reclaim)
                  return;
  
          /*
--- 545,554 ----