Index: memory.c
===================================================================
RCS file: /home/dot1/blah/cvs/linux/linux/mm/memory.c,v
retrieving revision 1.4
diff -u -r1.4 memory.c
--- memory.c	1997/07/30 02:15:34	1.4
+++ memory.c	1997/08/02 05:34:21
@@ -195,10 +195,16 @@
 		set_pte(new_pte, pte);
 		return;
 	}
-	if (cow)
+	if (cow) {
 		pte = pte_wrprotect(pte);
-	if (delete_from_swap_cache(&mem_map[page_nr]))
-		pte = pte_mkdirty(pte);
+		if (pte_dirty(pte)) {
+			if (!mem_map[page_nr].inode) {
+				/* it's a private mapping, can be marked clean if removed from swap cache */
+				delete_from_swap_cache(&mem_map[page_nr]);
+				pte = pte_mkclean(pte);
+			}
+		}
+	}
 	set_pte(new_pte, pte_mkold(pte));
 	set_pte(old_pte, pte);
 	atomic_inc(&mem_map[page_nr].count);