netdev - Re: skb_at_tc_ingress helper breaks compilation of oot modules

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Date:	Wed, 20 Apr 2016 12:38:11 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Ingo Saitz <ingo@...d.uni-hannover.de>
CC:	netdev@...r.kernel.org
Subject: Re: skb_at_tc_ingress helper breaks compilation of oot modules

On 04/20/2016 12:21 PM, Ingo Saitz wrote:
> In Linux 4.5, when CONFIG_NET_CLS_ACT is defined, compilation of out of
> tree modules breaks with undeclared functions/constants. The culprit is:
>
> commit fdc5432a7b44ab7de17141beec19d946b9344e91
> Author: Daniel Borkmann <daniel@...earbox.net>
> Date:   Thu Jan 7 15:50:22 2016 +0100
>
>      net, sched: add skb_at_tc_ingress helper
>
> which uses G_TC_AT and AT_INGRESS but only includes linux/pkt_cls.h,
> which does not include these #defines for oot builds. Unfortunately I'm
> not sure what the correct fix is, maybe the uapi folks could help, but i
> attached a simple testcase and build log (Makefile is straight from
> kernelnewbies).

Hmm, your fail.c test case only contains '#include <net/ipv6.h>'?

Note, upstream kernel never cared about out-of-tree modules, only
in-tree code. ;) Did you run into an issue with any in-tree code?

Thanks,
Daniel