re #13613 rb4516 Tunables needs volatile keyword

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1983, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   */
  
  /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  /*        All Rights Reserved   */
  
*** 482,492 ****
  /*
   * Extended attributes
   */
  
  #define XATTR_DIR_NAME  "/@/"
! extern int      ufs_ninode;             /* high-water mark for inode cache */
  
  extern struct vnodeops *ufs_vnodeops;   /* vnode operations for ufs */
  extern const struct fs_operation_def ufs_vnodeops_template[];
  
  /*
--- 483,493 ----
  /*
   * Extended attributes
   */
  
  #define XATTR_DIR_NAME  "/@/"
! extern volatile int     ufs_ninode;     /* high-water mark for inode cache */
  
  extern struct vnodeops *ufs_vnodeops;   /* vnode operations for ufs */
  extern const struct fs_operation_def ufs_vnodeops_template[];
  
  /*