--- mmap.c.0    Sun Dec 12 11:46:52 1999
+++ mmap.c      Sun Dec 12 11:54:25 1999
@@ -551,8 +551,7 @@
               mpnt->vm_page_prot = area->vm_page_prot;
               mpnt->vm_flags = area->vm_flags;
               mpnt->vm_ops = area->vm_ops;
-               mpnt->vm_pgoff = area->vm_pgoff;
-               area->vm_pgoff += (end - area->vm_start) >> PAGE_SHIFT;
+               mpnt->vm_pgoff = area->vm_pgoff + ((end - area->vm_start) >> PAGE_SHIFT);
               mpnt->vm_file = area->vm_file;
               mpnt->vm_private_data = area->vm_private_data;
               if (mpnt->vm_file)