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-rw-r--r--libpager/lock-object.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/libpager/lock-object.c b/libpager/lock-object.c
index d2f6da6d..5182eff8 100644
--- a/libpager/lock-object.c
+++ b/libpager/lock-object.c
@@ -1,5 +1,5 @@
/* Synchronous wrapper for memory_object_lock_request
- Copyright (C) 1993, 1994, 1996 Free Software Foundation
+ Copyright (C) 1993, 1994, 1996, 1997 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
@@ -30,9 +30,8 @@ _pager_lock_object (struct pager *p,
vm_prot_t lock_value,
int sync)
{
- struct lock_request *lr = 0;
- char *pm_entries;
int i;
+ struct lock_request *lr = 0;
mutex_lock (&p->interlock);
if (p->pager_state != NORMAL)
@@ -85,10 +84,20 @@ _pager_lock_object (struct pager *p,
if (should_flush)
{
+ vm_offset_t pm_offs = offset / __vm_page_size;
+
_pager_pagemap_resize (p, offset + size);
- pm_entries = &p->pagemap[offset / __vm_page_size];
- for (i = 0; i < size / vm_page_size; i++)
- pm_entries[i] &= ~PM_INCORE;
+ if (p->pagemapsize > pm_offs)
+ {
+ char *pm_entries = &p->pagemap[pm_offs];
+ vm_offset_t bound = size / vm_page_size;
+
+ if (bound > p->pagemapsize)
+ bound = p->pagemapsize;
+
+ for (i = 0; i < bound; i++)
+ pm_entries[i] &= ~PM_INCORE;
+ }
}
}