re #13613 rb4516 Tunables needs volatile keyword

@@ -24,10 +24,11 @@
  * Use is subject to license terms.
  */
 
 /*
  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  */
 
 #include <sys/timer.h>
 #include <sys/systm.h>
 #include <sys/param.h>

@@ -49,11 +50,11 @@
 /*
  * Tunable to increase the maximum number of POSIX timers per-process.  This
  * may _only_ be tuned in /etc/system or by patching the kernel binary; it
  * _cannot_ be tuned on a running system.
  */
-int timer_max = _TIMER_MAX;
+volatile int timer_max = _TIMER_MAX;
 
 /*
  * timer_lock() locks the specified interval timer.  It doesn't look at the
  * ITLK_REMOVE bit; it's up to callers to look at this if they need to
  * care.  p_lock must be held on entry; it may be dropped and reaquired,