Building with CONFIG_INFINIBAND=m, kconfig allows CONFIG_NET_9P_RDMA=m,No, there's no need to config INFINIBAND at built it. What's the value of CONFIG_INFINIBAND_ADDR_TRANS ?
so one module wants symbols from the other (net/9p wants symbols from rmda_*).
ERROR: "rdma_destroy_id" [net/9p/9pnet_rdma.ko] undefined!
ERROR: "rdma_connect" [net/9p/9pnet_rdma.ko] undefined!
...
Is this supposed to be allowed/possible? Otherwise NET_9P_RDMA might have to depend on INFINBAND=y...