re #13613 rb4516 Tunables needs volatile keyword

@@ -20,10 +20,13 @@
  */
 /*
  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
+/*
+ * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+ */
 
 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
 /*        All Rights Reserved   */
 
 /*

@@ -73,28 +76,28 @@
  * algorithm.  They are initialized to 0, and then computed at boot time
  * based on the size of the system.  If they are patched non-zero in
  * a loaded vmunix they are left alone and may thus be changed per system
  * using adb on the loaded system.
  */
-pgcnt_t         slowscan = 0;
-pgcnt_t         fastscan = 0;
+volatile pgcnt_t        slowscan = 0;
+volatile pgcnt_t        fastscan = 0;
 
-static pgcnt_t  handspreadpages = 0;
+volatile pgcnt_t        handspreadpages = 0;
 static int      loopfraction = 2;
 static pgcnt_t  looppages;
-static int      min_percent_cpu = 4;
+volatile int    min_percent_cpu = 4;
 static int      max_percent_cpu = 80;
 static pgcnt_t  maxfastscan = 0;
 static pgcnt_t  maxslowscan = 100;
 
-pgcnt_t maxpgio = 0;
-pgcnt_t minfree = 0;
-pgcnt_t desfree = 0;
-pgcnt_t lotsfree = 0;
+volatile pgcnt_t        maxpgio = 0;
+volatile pgcnt_t        minfree = 0;
+volatile pgcnt_t        desfree = 0;
+volatile pgcnt_t        lotsfree = 0;
 pgcnt_t needfree = 0;
-pgcnt_t throttlefree = 0;
-pgcnt_t pageout_reserve = 0;
+volatile pgcnt_t        throttlefree = 0;
+volatile pgcnt_t        pageout_reserve = 0;
 
 pgcnt_t deficit;
 pgcnt_t nscan;
 pgcnt_t desscan;