xprt.c:
  Speed up synchronous RPC over TCP calls by having the
  replies delivered by the IPV4 "bottom half", instead of
  switching to the rpciod process in order to call recvmsg().
   - Remove sock_recvmsg() interface.
   - Remove rpc_xprt_pending list and rpciod_tcp_dispatcher() interface.
   - Use the new tcp_read_sock() interface to deliver data directly
     from within tcp_data_ready().
sched.c:
   - Remove references to rpciod_tcp_dispatcher.
xprt.h:
   - New set of flags to reflect the TCP record read state.

Cheers,
  Trond