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The only user of msg->msg_iocb was AF_ALG, but that's deprecated. It can be removed entirely at the cost of only supporting synchronous operations. This doesn't break userspace, which will silently block (for a bounded amount of time) in io_submit instead of operating asynchronously. This also makes struct msghdr smaller, helping every other caller of sendmsg(). Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com> Acked-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>