--- Net2/vm/vm_page.h	2018/04/24 18:03:57	1.1.1.1
+++ Net2/vm/vm_page.h	2018/04/24 18:15:06	1.1.1.2
@@ -33,7 +33,8 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)vm_page.h	7.3 (Berkeley) 4/21/91
+ *	from: @(#)vm_page.h	7.3 (Berkeley) 4/21/91
+ *	vm_page.h,v 1.3 1993/05/20 03:59:38 cgd Exp
  *
  *
  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
@@ -62,13 +63,13 @@
  * rights to redistribute these changes.
  */
 
+#ifndef _VM_VM_PAGE_H_
+#define _VM_VM_PAGE_H_
+
 /*
  *	Resident memory system definitions.
  */
 
-#ifndef	_VM_PAGE_
-#define	_VM_PAGE_
-
 /*
  *	Management of resident (logical) pages.
  *
@@ -258,4 +259,5 @@ void		vm_set_page_size();
 
 #define vm_page_set_modified(m)	{ (m)->clean = FALSE; }
 #endif	KERNEL
-#endif	_VM_PAGE_
+
+#endif /* !_VM_VM_PAGE_H_ */