--- Gnu-Mach/vm/vm_external.h	2020/09/02 04:36:57	1.1
+++ Gnu-Mach/vm/vm_external.h	2020/09/02 04:52:07	1.1.1.4
@@ -1,25 +1,25 @@
-/* 
+/*
  * Mach Operating System
  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  * All Rights Reserved.
- * 
+ *
  * Permission to use, copy, modify and distribute this software and its
  * documentation is hereby granted, provided that both the copyright
  * notice and this permission notice appear in all copies of the
  * software, derivative works or modified versions, and any portions
  * thereof, and that both notices appear in supporting documentation.
- * 
+ *
  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- * 
+ *
  * Carnegie Mellon requests users of this software to return to
- * 
+ *
  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  *  School of Computer Science
  *  Carnegie Mellon University
  *  Pittsburgh PA 15213-3890
- * 
+ *
  * any improvements or extensions that they make and grant Carnegie Mellon
  * the rights to redistribute these changes.
  */
@@ -46,9 +46,14 @@ typedef struct vm_external {
 					 * been written to backing
 					 * storage.
 					 */
+#if 0
+	/* XXX: Currently, existence_count is not used.  I guess it
+	   could be useful to get rid of the map if the count drops to
+	   zero.  */
 	int		existence_count;/* Number of bits turned on in
 					 * existence_map.
 					 */
+#endif
 } *vm_external_t;
 
 #define	VM_EXTERNAL_NULL	((vm_external_t) 0)
@@ -70,20 +75,21 @@ typedef int	vm_external_state_t;
  *	Routines exported by this module.
  */
 
-extern void		vm_external_module_initialize();
-						/* Initialize the module */
-
-extern vm_external_t	vm_external_create();	/* Create a vm_external_t */
-extern void vm_external_destroy();		/* Destroy one */
-
-extern void		vm_external_state_set();/* Set state of a page. */
+/* Initialize the module */
+extern void		vm_external_module_initialize(void);
+/* Create a vm_external_t */
+extern vm_external_t	vm_external_create(vm_offset_t);
+/* Destroy one */
+extern void vm_external_destroy(vm_external_t);
+
+/* Set state of a page.  */
+extern void		vm_external_state_set(vm_external_t, vm_offset_t,
+					      vm_external_state_t);
+/* Retrieve the state for a given page, if known.  */
 #define	vm_external_state_get(e,offset)	(((e) != VM_EXTERNAL_NULL) ? \
 					  _vm_external_state_get(e, offset) : \
 					  VM_EXTERNAL_STATE_UNKNOWN)
-						/* Retrieve the state
-						 * for a given page, if known.
-						 */
-extern vm_external_state_t _vm_external_state_get();
-						/* HIDDEN routine */
+/* HIDDEN routine */
+extern vm_external_state_t _vm_external_state_get(vm_external_t, vm_offset_t);
 
-#endif	_VM_VM_EXTERNAL_H_
+#endif	/* _VM_VM_EXTERNAL_H_ */