page_list_break
page_list_break(&pplist, &npplist, btop(io_off - pp_off));
page_list_break(&pplist, &npplist, btop(io_len));
page_list_break(&cpp, &npp, btop(cur_len));
page_list_break(&cpp, &npp, btopr(cur_len));
page_list_break(&pp, &trunc, npages);
void page_list_break(page_t **, page_t **, size_t);
page_list_break(&pp, &pplist, curnpgs);
page_list_break(&pp, &pplist, curnpgs);
page_list_break(&pplist, &npplist, npgs);
page_list_break(ppp, &pmem_mpool, i);
page_list_break(lppp, &pp, n - r);