RDSV3_MSG_ACK_REQUIRED
if (test_bit(RDSV3_MSG_ACK_REQUIRED, &rm->m_flags))
set_bit(RDSV3_MSG_ACK_REQUIRED, &rm->m_flags);
set_bit(RDSV3_MSG_ACK_REQUIRED, &rm->m_flags);
set_bit(RDSV3_MSG_ACK_REQUIRED, &rm->m_flags);