NVME_RW_PRINFO_PRCHK_GUARD
control |= NVME_RW_PRINFO_PRCHK_GUARD;
if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_GUARD)
if (control & NVME_RW_PRINFO_PRCHK_GUARD)