re #13613 rb4516 Tunables needs volatile keyword

@@ -19,13 +19,15 @@
  * 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/vmsystm.h>
 #include <inet/common.h>
 #include "sctp_impl.h"
 
 /* Control whether SCTP can enter defensive mode when under memory pressure. */
 static boolean_t sctp_do_reclaim = B_TRUE;

@@ -152,11 +154,10 @@
 sctp_reclaim_timer(void *arg)
 {
         sctp_stack_t *sctps = (sctp_stack_t *)arg;
         int64_t tot_assoc = 0;
         int i;
-        extern pgcnt_t lotsfree, needfree;
 
         for (i = 0; i < sctps->sctps_sc_cnt; i++)
                 tot_assoc += sctps->sctps_sc[i]->sctp_sc_assoc_cnt;
 
         /*

@@ -193,11 +194,10 @@
 sctp_conn_reclaim(void *arg)
 {
         netstack_handle_t nh;
         netstack_t *ns;
         sctp_stack_t *sctps;
-        extern pgcnt_t lotsfree, needfree;
 
         if (!sctp_do_reclaim)
                 return;
 
         /*