re #13613 rb4516 Tunables needs volatile keyword

@@ -18,12 +18,11 @@
  *
  * CDDL HEADER END
  */
 /*
  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
- *
- * Copyright 2011, 2012 Nexenta Systems, Inc. All rights reserved.
+ * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  * Copyright 2013 Joyent, Inc. All rights reserved.
  */
 
 /*
  * This is the loadable module wrapper.

@@ -59,13 +58,13 @@
         &mod_fsops,
         "network filesystem version 4",
         &vfw4
 };
 
-uint_t nfs4_max_transfer_size = 32 * 1024;
-uint_t nfs4_max_transfer_size_cots = 1024 * 1024;
-uint_t nfs4_max_transfer_size_rdma = 1024 * 1024;
+volatile uint_t nfs4_max_transfer_size = 32 * 1024;
+volatile uint_t nfs4_max_transfer_size_cots = 1024 * 1024;
+volatile uint_t nfs4_max_transfer_size_rdma = 1024 * 1024;
 
 int
 nfs4tsize(void)
 {
         /*