Re: [PATCH] neighbour: purge nf_bridged skb from foreign device neigh

From: kernel test robot <lkp@intel.com>
To: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: oe-kbuild-all@lists.linux.dev, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, kernel@openvz.org,
	Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Subject: Re: [PATCH] neighbour: purge nf_bridged skb from foreign device neigh
Date: Tue, 9 Jan 2024 17:01:26 +0800	[thread overview]
Message-ID: <202401091607.P1JJMaxg-lkp@intel.com> (raw)
In-Reply-To: <20240108085232.95437-1-ptikhomirov@virtuozzo.com>

Hi Pavel,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]
[also build test WARNING on net/main linus/master horms-ipvs/master v6.7 next-20240109]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Pavel-Tikhomirov/neighbour-purge-nf_bridged-skb-from-foreign-device-neigh/20240108-165551
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240108085232.95437-1-ptikhomirov%40virtuozzo.com
patch subject: [PATCH] neighbour: purge nf_bridged skb from foreign device neigh
config: i386-defconfig (https://download.01.org/0day-ci/archive/20240109/202401091607.P1JJMaxg-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240109/202401091607.P1JJMaxg-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401091607.P1JJMaxg-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/core/neighbour.c: In function 'neigh_purge_nf_bridge_dev':
   net/core/neighbour.c:392:15: error: implicit declaration of function 'nf_bridge_info_get'; did you mean 'nf_bridge_in_prerouting'? [-Werror=implicit-function-declaration]
      nf_bridge = nf_bridge_info_get(skb);
                  ^~~~~~~~~~~~~~~~~~
                  nf_bridge_in_prerouting
>> net/core/neighbour.c:392:13: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      nf_bridge = nf_bridge_info_get(skb);
                ^
   net/core/neighbour.c:395:29: error: dereferencing pointer to incomplete type 'struct nf_bridge_info'
      if (nf_bridge && nf_bridge->physindev == dev) {
                                ^~
   cc1: some warnings being treated as errors

vim +392 net/core/neighbour.c

   382	
   383	static void neigh_purge_nf_bridge_dev(struct neighbour *neigh, struct net_device *dev)
   384	{
   385		struct sk_buff_head *list = &neigh->arp_queue;
   386		struct nf_bridge_info *nf_bridge;
   387		struct sk_buff *skb, *next;
   388	
   389		write_lock(&neigh->lock);
   390		skb = skb_peek(list);
   391		while (skb) {
 > 392			nf_bridge = nf_bridge_info_get(skb);
   393	
   394			next = skb_peek_next(skb, list);
   395			if (nf_bridge && nf_bridge->physindev == dev) {
   396				__skb_unlink(skb, list);
   397				neigh->arp_queue_len_bytes -= skb->truesize;
   398				kfree_skb(skb);
   399			}
   400			skb = next;
   401		}
   402		write_unlock(&neigh->lock);
   403	}
   404	

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