From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH V2 net-next 2/3] tcp: TCP experimental option for SMC
Date: Wed, 25 Oct 2017 09:55:03 +0900 (KST)
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From: Ursula Braun <ubraun@linux.vnet.ibm.com>
Date: Wed, 18 Oct 2017 16:29:59 +0200

> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 3b3b9b968e2d..a2e87ac8cdc0 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -45,6 +45,7 @@
>  
>  #include <linux/seq_file.h>
>  #include <linux/memcontrol.h>
> +#include <linux/unaligned/access_ok.h>

Only tcp_input.c needs this include.  If you include it here, then the
rest of the kernel pays the price of this include.