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ibv_poll_cq on peer-direct CQ does not have proper memory fencing/flushing #8

@drossetti

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@drossetti

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if (cq->peer_peek_table[idx]->busy) {

cq->peer_peek_table[idx]->busy could be asynchronously updated by a PCIe device, so it needs a platform-dependent way of forcing a memory read (a la READ_ONCE or more).

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