re #13613 rb4516 Tunables needs volatile keyword

*** 20,29 ****
--- 20,32 ----
   */
  /*
   * 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   */
  
  /*
*** 73,100 ****
   * 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;
  
! static pgcnt_t  handspreadpages = 0;
  static int      loopfraction = 2;
  static pgcnt_t  looppages;
! static 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;
  pgcnt_t needfree = 0;
! pgcnt_t throttlefree = 0;
! pgcnt_t pageout_reserve = 0;
  
  pgcnt_t deficit;
  pgcnt_t nscan;
  pgcnt_t desscan;
  
--- 76,103 ----
   * 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.
   */
! volatile pgcnt_t        slowscan = 0;
! volatile pgcnt_t        fastscan = 0;
  
! volatile pgcnt_t        handspreadpages = 0;
  static int      loopfraction = 2;
  static pgcnt_t  looppages;
! volatile int    min_percent_cpu = 4;
  static int      max_percent_cpu = 80;
  static pgcnt_t  maxfastscan = 0;
  static pgcnt_t  maxslowscan = 100;
  
! volatile pgcnt_t        maxpgio = 0;
! volatile pgcnt_t        minfree = 0;
! volatile pgcnt_t        desfree = 0;
! volatile pgcnt_t        lotsfree = 0;
  pgcnt_t needfree = 0;
! volatile pgcnt_t        throttlefree = 0;
! volatile pgcnt_t        pageout_reserve = 0;
  
  pgcnt_t deficit;
  pgcnt_t nscan;
  pgcnt_t desscan;