I have some problem for pmapmove().

This function moves physical pages from one virtual address
to another virtual address.  But I didn't find any code for
changing pv list.  The code like the following should be in
pmapmove():

	pa = pmap_pte_pa(fpte);
	bank = vm_physseg_find(atop(pa), &off);
	for (pv = &vm_physmem[bank].pmseg.pvent[off]; pv; pv = pv->pv_next) {
		if (pv->pv_pmap == pmap_kernel() && pv->pv_va == from) {
			pv->pv_va = to;
			break;
		}
	}

Can anyone answer why the absence of these code?  Thanks a lot.