From: Ying Xue <redacted>
Date: Fri, 27 Feb 2015 19:06:35 +0800

Currently there is only one user - TIPC whose sendmsg() instances
using iocb argument. Meanwhile, there is no user using iocb argument
in its recvmsg() instance. Therefore, if we eliminate the werid usage
of iobc argument from TIPC, the iocb argument can be removed from
all sendmsg() and recvmsg() instances of the whole network stack.

By the way, as patch #2 is very big, I can divide it into smaller
patches regarding module in next version if necessary.

Reference:
https://patchwork.ozlabs.org/patch/433960/

You didn't even properly compile test this patch series:

net/dccp/proto.c:744:5: error: conflicting types for ‘dccp_sendmsg’
 int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
     ^
In file included from net/dccp/proto.c:37:0:
net/dccp/dccp.h:313:5: note: previous declaration of ‘dccp_sendmsg’ was here
 int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
     ^
 ...
net/dccp/proto.c:808:5: error: conflicting types for ‘dccp_recvmsg’
 int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
     ^
In file included from net/dccp/proto.c:37:0:
net/dccp/dccp.h:315:5: note: previous declaration of ‘dccp_recvmsg’ was here
 int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
     ^