[src/trunk]: src/sys/uvm amap_copy: fix one more regression, thanks to enami@.

[rmind <rmind%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4f36ec4a55cc
branches:  trunk
changeset: 766499:4f36ec4a55cc
user:      rmind <rmind%NetBSD.org@localhost>
date:      Fri Jun 24 01:48:43 2011 +0000

description:
amap_copy: fix one more regression, thanks to enami@.

diffstat:

 sys/uvm/uvm_amap.c |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (31 lines):

diff -r 654529b9621b -r 4f36ec4a55cc sys/uvm/uvm_amap.c
--- a/sys/uvm/uvm_amap.c        Fri Jun 24 01:39:41 2011 +0000
+++ b/sys/uvm/uvm_amap.c        Fri Jun 24 01:48:43 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_amap.c,v 1.98 2011/06/24 01:39:22 rmind Exp $      */
+/*     $NetBSD: uvm_amap.c,v 1.99 2011/06/24 01:48:43 rmind Exp $      */
 
 /*
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_amap.c,v 1.98 2011/06/24 01:39:22 rmind Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_amap.c,v 1.99 2011/06/24 01:48:43 rmind Exp $");
 
 #include "opt_uvmhist.h"
 
@@ -818,7 +818,11 @@
                UVMHIST_LOG(maphist, "<- done [creating new amap 0x%x->0x%x]",
                    entry->start, entry->end, 0, 0);
 
-               /* Allocate an initialised amap and install it. */
+               /*
+                * Allocate an initialised amap and install it.
+                * Note: we must update the length after clipping.
+                */
+               len = entry->end - entry->start;
                entry->aref.ar_pageoff = 0;
                entry->aref.ar_amap = amap_alloc(len, 0, waitf);
                if (entry->aref.ar_amap != NULL) {