Now
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No assignment is needed here.
the loop in pmap_page_remove() always removes the first pv,
and since the list is managed by _pmap_remove_pv(), pp->pp_pv.pv_next always points to the first.
the loop in pmap_page_remove() always removes the first pv,
and since the list is managed by _pmap_remove_pv(), pp->pp_pv.pv_next always points to the first.