EFA_PTRS_PER_CHUNK
((EFA_PTRS_PER_CHUNK * EFA_CHUNK_PAYLOAD_PTR_SIZE) + EFA_CHUNK_PTR_SIZE)
chunk_list_size = DIV_ROUND_UP(page_cnt, EFA_PTRS_PER_CHUNK);
((page_cnt % EFA_PTRS_PER_CHUNK) * EFA_CHUNK_PAYLOAD_PTR_SIZE) +
if (payload_idx == EFA_PTRS_PER_CHUNK) {
&prev_chunk_buf[EFA_PTRS_PER_CHUNK];