re #13613 rb4516 Tunables needs volatile keyword

@@ -20,10 +20,13 @@
  */
 /*
  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
+/*
+ * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+ */
 
 /*
  *      Copyright (c) 1983,1984,1985,1986,1987,1988,1989 AT&T.
  *      All rights reserved.
  */

@@ -1662,11 +1665,11 @@
                 crfree(ncrfree);
 
         return (error);
 }
 
-static int nfs3_do_symlink_cache = 1;
+volatile int nfs3_do_symlink_cache = 1;
 
 /* ARGSUSED */
 static int
 nfs3_readlink(vnode_t *vp, struct uio *uiop, cred_t *cr, caller_context_t *ct)
 {

@@ -1991,11 +1994,11 @@
                 VN_RELE(avp);
 
         return (error);
 }
 
-static int nfs3_lookup_neg_cache = 1;
+volatile int nfs3_lookup_neg_cache = 1;
 
 #ifdef DEBUG
 static int nfs3_lookup_dnlc_hits = 0;
 static int nfs3_lookup_dnlc_misses = 0;
 static int nfs3_lookup_dnlc_neg_hits = 0;

@@ -3697,11 +3700,11 @@
 static int nfs3_readdir_cache_waits = 0;
 static int nfs3_readdir_cache_misses = 0;
 static int nfs3_readdir_readahead = 0;
 #endif
 
-static int nfs3_shrinkreaddir = 0;
+volatile int nfs3_shrinkreaddir = 0;
 
 /*
  * Read directory entries.
  * There are some weird things to look out for here.  The uio_loffset
  * field is either 0 or it is the offset returned from a previous

@@ -4516,11 +4519,11 @@
 }
 
 /*
  * number of nfs3_bsize blocks to read ahead.
  */
-static int nfs3_nra = 4;
+volatile int nfs3_nra = 4;
 
 #ifdef DEBUG
 static int nfs3_lostpage = 0;   /* number of times we lost original page */
 #endif
 

@@ -5704,11 +5707,11 @@
         dmapp->caller->error = error;
         (void) as_delete_callback(as, arg);
         kmem_free(dmapp, sizeof (nfs_delmap_args_t));
 }
 
-static int nfs3_pathconf_disable_cache = 0;
+volatile int nfs3_pathconf_disable_cache = 0;
 
 #ifdef DEBUG
 static int nfs3_pathconf_cache_hits = 0;
 static int nfs3_pathconf_cache_misses = 0;
 #endif