From 47ab1071a249efe8a7f69b6dfd4549af49f527de Mon Sep 17 00:00:00 2001
From: dg <dg@FreeBSD.org>
Date: Sat, 16 Mar 1996 15:00:05 +0000
Subject: Force device mappings to always be shared. It doesn't make sense for
 them to ever be COW and we need the mappings to be shared for backward
 compatibilty.

Reviewed by:	dyson
---
 sys/vm/vm_mmap.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'sys/vm')

diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index e1de743..72a3b6b 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -38,7 +38,7 @@
  * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
  *
  *	@(#)vm_mmap.c	8.4 (Berkeley) 1/12/94
- * $Id: vm_mmap.c,v 1.38 1996/03/02 17:14:09 peter Exp $
+ * $Id: vm_mmap.c,v 1.39 1996/03/12 02:27:20 dyson Exp $
  */
 
 /*
@@ -754,11 +754,12 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff)
 		return (type == OBJT_DEVICE ? EINVAL : ENOMEM);
 
 	/*
-	 * default to MAP_SHARED on a device mapping
+	 * Force device mappings to be shared.
 	 */
-	if ((type == OBJT_DEVICE) &&
-		(flags & (MAP_SHARED|MAP_COPY|MAP_PRIVATE)) == 0)
+	if (type == OBJT_DEVICE) {
+		flags &= ~(MAP_PRIVATE|MAP_COPY);
 		flags |= MAP_SHARED;
+	}
 
 	object2 = NULL;
 	docow = 0;
-- 
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