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< CoherentXBar::recvAtomic(PacketPtr pkt, PortID slave_port_id)
---
> CoherentXBar::recvAtomicBackdoor(PacketPtr pkt, PortID slave_port_id,
> MemBackdoorPtr *backdoor)
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< response_latency = masterPorts[master_port_id]->sendAtomic(pkt);
---
> auto master = masterPorts[master_port_id];
> response_latency = backdoor ?
> master->sendAtomicBackdoor(pkt, *backdoor) :
> master->sendAtomic(pkt);