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vm_offset_t. (This field is used to detect sequential access to the virtual address range represented by the map entry.) There are three reasons to make this change. First, a vm_offset_t is smaller on 32-bit architectures. Consequently, a struct vm_map_entry is now smaller on 32-bit architectures. Second, a vm_offset_t can be written atomically, whereas it may not be possible to write a vm_pindex_t atomically on a 32-bit architecture. Third, using a vm_pindex_t makes the next_read field dependent on which object in the shadow chain is being read from. Replace an "XXX" comment. Reviewed by: kib Approved by: re (gjb) Sponsored by: EMC / Isilon Storage Division
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