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Is there any reason the following isn't correct?  It gets rid of the variable 
which generates the warning, rather than initializing it to something bogus.

Rationale:

"fudge" is only set on the first pass through the loop, and only in the case 
where we didn't clip, so we know that oldstart is always the same value as 
entry->start on line 1729, where "fudge" was calculated the first time.  
Therefore the recalculation of "fudge" is:

fudge = fudge - (entry->start[new] - oldstart)
      = (start - entry->start[old]) - (entry->start[new] - entry->start[old])
      = start - entry->start[new]

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Index: uvm_map.c
===================================================================
RCS file: /cvsroot/src/sys/uvm/uvm_map.c,v
retrieving revision 1.142
diff -u -r1.142 uvm_map.c
--- uvm_map.c	9 Oct 2003 03:12:29 -0000	1.142
+++ uvm_map.c	27 Oct 2003 16:47:37 -0000
@@ -1670,8 +1670,7 @@
 uvm_map_extract(struct vm_map *srcmap, vaddr_t start, vsize_t len,
     struct vm_map *dstmap, vaddr_t *dstaddrp, int flags)
 {
-	vaddr_t dstaddr, end, newend, oldoffset, fudge, orig_fudge,
-	    oldstart;
+	vaddr_t dstaddr, end, newend, oldoffset, fudge, orig_fudge;
 	struct vm_map_entry *chain, *endchain, *entry, *orig_entry, *newentry,
 	    *deadentry, *oldentry;
 	vsize_t elen;
@@ -1768,10 +1767,6 @@
 
 		/* clear needs_copy (allow chunking) */
 		if (UVM_ET_ISNEEDSCOPY(entry)) {
-			if (fudge)
-				oldstart = entry->start;
-			else
-				oldstart = 0;	/* XXX: gcc */
 			amap_copy(srcmap, entry, M_NOWAIT, TRUE, start, end);
 			if (UVM_ET_ISNEEDSCOPY(entry)) {  /* failed? */
 				error = ENOMEM;
@@ -1780,7 +1775,7 @@
 
 			/* amap_copy could clip (during chunk)!  update fudge */
 			if (fudge) {
-				fudge = fudge - (entry->start - oldstart);
+				fudge = start - entry->start;
 				orig_fudge = fudge;
 			}
 		}

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