mempool_init_page_pool
if (mempool_init_page_pool(&integrity_buf_pool, BIO_POOL_SIZE,
ret = mempool_init_page_pool(&drbd_md_io_page_pool, DRBD_MIN_POOL_PAGES, 0);
ret = mempool_init_page_pool(&drbd_buffer_page_pool, number, 0);
return mempool_init_page_pool(&state->pool, 1, page_order);
r = mempool_init_page_pool(&ic->recheck_pool, 1, ic->mode == 'I' ? 1 : 0);
r = mempool_init_page_pool(&v->recheck_pool, 1, 0);
ret = mempool_init_page_pool(&log->meta_pool, R5L_POOL_SIZE, 0);
ret = mempool_init_page_pool(pool, pool_size, order);