ASYNC_TX_PQ_XOR_DST
if (submit->flags & ASYNC_TX_PQ_XOR_DST) {
if (unmap && !(submit->flags & ASYNC_TX_PQ_XOR_DST) &&
init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx,
txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST;