rounddown_pow_of_two
sg_prefetch_align = rounddown_pow_of_two(sg_prefetch_align);
rx = rounddown_pow_of_two(sys_op->rx_pending);
tx = rounddown_pow_of_two(sys_op->tx_pending);
fl_q_size = rounddown_pow_of_two(fl_q_size);
jumbo_q_size = rounddown_pow_of_two(jumbo_q_size);
iaq->nrxq = rounddown_pow_of_two(iaq->nrxq - 1);
qpwanted = rounddown_pow_of_two(qpwanted);
rounddown_pow_of_two(dev->caps.num_eqs);
rounddown_pow_of_two(func.max_eq);
rounddown_pow_of_two(ring->actual_size);
rounddown_pow_of_two(num_rx_rings);