linux-kernel - Re: [PATCH] netfilter: turn NF

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Date:	Fri, 09 Oct 2015 13:21:54 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Arnd Bergmann <arnd@...db.de>
Cc:	kbuild test robot <lkp@...el.com>, kbuild-all@...org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] netfilter: turn NF_HOOK into an inline function

Arnd Bergmann <arnd@...db.de> writes:

> On Friday 09 October 2015 21:03:57 kbuild test robot wrote:
>> ^1da177e Linus Torvalds    2005-04-16  818      cb->rt_flags &= ~DN_RT_F_IE;
>> ^1da177e Linus Torvalds    2005-04-16  819      if (rt->rt_flags & RTCF_DOREDIRECT)
>> ^1da177e Linus Torvalds    2005-04-16  820              cb->rt_flags |= DN_RT_F_IE;
>> ^1da177e Linus Torvalds    2005-04-16  821  
>> 29a26a56 Eric W. Biederman 2015-09-15  822      return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD,
>> 29a26a56 Eric W. Biederman 2015-09-15 @823                     &init_net, NULL, skb, dev, skb->dev,
>> 8f40b161 David S. Miller   2011-07-17  824                     dn_to_neigh_output);
>> ^1da177e Linus Torvalds    2005-04-16  825  
>> ^1da177e Linus Torvalds    2005-04-16  826  drop:
>> 
>
> Ah, right. The 'dev' variable here is declared as
>
> #ifdef CONFIG_NETFILTER
>         struct net_device *dev = skb->dev;
> #endif
>
> Apparently because the code produced the same warning as the ipv6 code.
>
> Removing the #ifdef here would make that code nicer and let us use
> my patch. Alternatively we could put the same #ifdef into IPV6 and
> not use the inline function.

Compilers are good at removing unused variabes (SSA should guarantee
this will always happen), and #ifdefs sucks.  I vote for your inline.
Especially as the case that is actively used and tested
(CONFIG_NETFILTER) has these two functions as inline functions.

Eric
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