bm_map_pidx
p_addr = bm_map_pidx(b, bm_bit_to_page_idx(b, bitnr));
p_addr = bm_map_pidx(b, idx);
p_addr = bm_map_pidx(b, bm_word_to_page_idx(b, s));
p_addr = bm_map_pidx(b, b->bm_number_of_pages - 1);
p_addr = bm_map_pidx(b, b->bm_number_of_pages - 1);
p_addr = bm_map_pidx(b, idx);
p_addr = bm_map_pidx(b, idx);
p_addr = bm_map_pidx(b, bm_word_to_page_idx(b, offset));