NEX-5164 backport illumos 6514 AS_* lock macros simplification
Reviewed by: Kevin Crowe <kevin.crowe@nexenta.com>
6514 AS_* lock macros simplification
Reviewed by: Piotr Jasiukajtis <estibi@me.com>
Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com>
Reviewed by: Albert Lee <trisk@omniti.com>
Approved by: Dan McDonald <danmcd@omniti.com>
re #13613 rb4516 Tunables needs volatile keyword

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1986, 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   */
  
*** 71,81 ****
  #include <vm/seg.h>
  #include <vm/page.h>
  #include <vm/seg_vn.h>
  #include <vm/seg_kmem.h>
  
! extern int maxphys;
  
  void
  minphys(struct buf *bp)
  {
          if (bp->b_bcount > maxphys)
--- 72,82 ----
  #include <vm/seg.h>
  #include <vm/page.h>
  #include <vm/seg_vn.h>
  #include <vm/seg_kmem.h>
  
! #include <sys/sunddi.h>
  
  void
  minphys(struct buf *bp)
  {
          if (bp->b_bcount > maxphys)