From 7e15fd27577744fa48ca9fde818f113b7bd52927 Mon Sep 17 00:00:00 2001
From: John Dyson <dyson@FreeBSD.org>
Date: Fri, 21 Apr 1995 02:48:40 +0000
Subject: [PATCH] Fixed a problem in _vm_object_page_clean that could cause an
 infinite loop.

---
 sys/vm/vm_object.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index f1455159bf17..036a5ee9a995 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -61,7 +61,7 @@
  * any improvements or extensions that they make and grant Carnegie the
  * rights to redistribute these changes.
  *
- * $Id: vm_object.c,v 1.42 1995/04/16 03:11:28 davidg Exp $
+ * $Id: vm_object.c,v 1.43 1995/04/16 12:56:19 davidg Exp $
  */
 
 /*
@@ -529,9 +529,11 @@ _vm_object_page_clean(object, start, end, syncio)
 			if ((p->valid & p->dirty) != 0) {
 				vm_offset_t tincr;
 				tincr = vm_pageout_clean(p, VM_PAGEOUT_FORCE);
-				pgcount -= (tincr - 1);
-				tincr *= PAGE_SIZE;
-				tstart += tincr - PAGE_SIZE;
+				if( tincr) {
+					pgcount -= (tincr - 1);
+					tincr *= PAGE_SIZE;
+					tstart += tincr - PAGE_SIZE;
+				}
 				allclean = 0;
 			}
 		}