re #13613 rb4516 Tunables needs volatile keyword

@@ -21,10 +21,13 @@
  */
 /*
  * Copyright 1999 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   */
 
 /*

@@ -138,11 +141,11 @@
 };
 
 extern struct dqhead dqhead[NDQHASH];
 
 extern struct dquot *dquot, *dquotNDQUOT;
-extern int ndquot;
+extern volatile int ndquot;
 extern krwlock_t dq_rwlock;             /* quota sub-system init lock */
 extern int quotas_initialized;          /* quota sub-system init flag */
 
 extern void qtinit();
 extern void qtinit2();