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.
+  */
  
  #include <sys/systm.h>
  #include <sys/types.h>
  #include <sys/vnode.h>
  #include <sys/errno.h>
*** 76,86 ****
  /*
   * externs
   */
  extern kmutex_t         ml_scan;
  extern kcondvar_t       ml_scan_cv;
- extern int              maxphys;
  
  static void
  trans_roll_wait(mt_map_t *logmap, callb_cpr_t *cprinfop)
  {
          mutex_enter(&logmap->mtm_mutex);
--- 79,88 ----