From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] ipvlan: fix building without netfilter
Date: Thu, 22 Sep 2016 08:32:05 -0400 (EDT)
Message-ID: <20160922.083205.2034005377472668654.davem@davemloft.net>
References: <20160922094130.2154824-1-arnd@arndb.de>
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Cc: maheshb@google.com, dsa@cumulusnetworks.com, edumazet@google.com,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
To: arnd@arndb.de
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From: Arnd Bergmann <arnd@arndb.de>
Date: Thu, 22 Sep 2016 11:40:52 +0200

> The new l3s mode in ipvlan relies on netfilter interfaces, but
> the ipvlan driver can be configured when CONFIG_NETFILTER is disabled,
> leading to a build error:
> 
> drivers/net/ipvlan/ipvlan.h:132:22: error: 'struct nf_hook_state' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
> drivers/net/ipvlan/ipvlan_main.c:14:27: error: array type has incomplete element type 'struct nf_hook_ops'
> ...
> 
> This adds a forward declaration for struct nf_hook_state, and hides
> the newly added l3s code in an #ifdef.
> 
> Fixes: 4fbae7d83c98 ("ipvlan: Introduce l3s mode")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

I'm pretty sure I applied a Kconfig patch that added the
necessary dependency.