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Date:   Thu, 7 Feb 2019 08:55:15 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        Stefano Brivio <sbrivio@...hat.com>,
        David Miller <davem@...emloft.net>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: Re: [PATCH net 1/2] geneve: should not call rt6_lookup() when ipv6
 was disabled

Hi Hangbin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net/master]

url:    https://github.com/0day-ci/linux/commits/Hangbin-Liu/fix-two-kernel-panics-when-disabled-IPv6-on-boot-up/20190207-071954
config: m68k-sun3_defconfig (attached as .config)
compiler: m68k-linux-gnu-gcc (Debian 8.2.0-11) 8.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.2.0 make.cross ARCH=m68k 

All warnings (new ones prefixed by >>):

   drivers/net/geneve.c: In function 'geneve_link_config':
>> drivers/net/geneve.c:1519:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
      struct rt6_info *rt = rt6_lookup(geneve->net,
      ^~~~~~

vim +1519 drivers/net/geneve.c

abe492b4f5 Tom Herbert    2015-12-10  1490  
c40e89fd35 Alexey Kodanev 2018-04-19  1491  static void geneve_link_config(struct net_device *dev,
c40e89fd35 Alexey Kodanev 2018-04-19  1492  			       struct ip_tunnel_info *info, struct nlattr *tb[])
c40e89fd35 Alexey Kodanev 2018-04-19  1493  {
c40e89fd35 Alexey Kodanev 2018-04-19  1494  	struct geneve_dev *geneve = netdev_priv(dev);
c40e89fd35 Alexey Kodanev 2018-04-19  1495  	int ldev_mtu = 0;
c40e89fd35 Alexey Kodanev 2018-04-19  1496  
c40e89fd35 Alexey Kodanev 2018-04-19  1497  	if (tb[IFLA_MTU]) {
c40e89fd35 Alexey Kodanev 2018-04-19  1498  		geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
c40e89fd35 Alexey Kodanev 2018-04-19  1499  		return;
c40e89fd35 Alexey Kodanev 2018-04-19  1500  	}
c40e89fd35 Alexey Kodanev 2018-04-19  1501  
c40e89fd35 Alexey Kodanev 2018-04-19  1502  	switch (ip_tunnel_info_af(info)) {
c40e89fd35 Alexey Kodanev 2018-04-19  1503  	case AF_INET: {
c40e89fd35 Alexey Kodanev 2018-04-19  1504  		struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
c40e89fd35 Alexey Kodanev 2018-04-19  1505  		struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
c40e89fd35 Alexey Kodanev 2018-04-19  1506  
c40e89fd35 Alexey Kodanev 2018-04-19  1507  		if (!IS_ERR(rt) && rt->dst.dev) {
c40e89fd35 Alexey Kodanev 2018-04-19  1508  			ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
c40e89fd35 Alexey Kodanev 2018-04-19  1509  			ip_rt_put(rt);
c40e89fd35 Alexey Kodanev 2018-04-19  1510  		}
c40e89fd35 Alexey Kodanev 2018-04-19  1511  		break;
c40e89fd35 Alexey Kodanev 2018-04-19  1512  	}
c40e89fd35 Alexey Kodanev 2018-04-19  1513  #if IS_ENABLED(CONFIG_IPV6)
c40e89fd35 Alexey Kodanev 2018-04-19  1514  	case AF_INET6: {
55e942d018 Hangbin Liu    2019-02-06  1515  		struct inet6_dev *idev = in6_dev_get(dev);
55e942d018 Hangbin Liu    2019-02-06  1516  		if (!idev)
55e942d018 Hangbin Liu    2019-02-06  1517  			break;
55e942d018 Hangbin Liu    2019-02-06  1518  
c40e89fd35 Alexey Kodanev 2018-04-19 @1519  		struct rt6_info *rt = rt6_lookup(geneve->net,
c40e89fd35 Alexey Kodanev 2018-04-19  1520  						 &info->key.u.ipv6.dst, NULL, 0,
c40e89fd35 Alexey Kodanev 2018-04-19  1521  						 NULL, 0);
c40e89fd35 Alexey Kodanev 2018-04-19  1522  
c40e89fd35 Alexey Kodanev 2018-04-19  1523  		if (rt && rt->dst.dev)
c40e89fd35 Alexey Kodanev 2018-04-19  1524  			ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
c40e89fd35 Alexey Kodanev 2018-04-19  1525  		ip6_rt_put(rt);
55e942d018 Hangbin Liu    2019-02-06  1526  
55e942d018 Hangbin Liu    2019-02-06  1527  		in6_dev_put(idev);
c40e89fd35 Alexey Kodanev 2018-04-19  1528  		break;
c40e89fd35 Alexey Kodanev 2018-04-19  1529  	}
c40e89fd35 Alexey Kodanev 2018-04-19  1530  #endif
c40e89fd35 Alexey Kodanev 2018-04-19  1531  	}
c40e89fd35 Alexey Kodanev 2018-04-19  1532  
c40e89fd35 Alexey Kodanev 2018-04-19  1533  	if (ldev_mtu <= 0)
c40e89fd35 Alexey Kodanev 2018-04-19  1534  		return;
c40e89fd35 Alexey Kodanev 2018-04-19  1535  
c40e89fd35 Alexey Kodanev 2018-04-19  1536  	geneve_change_mtu(dev, ldev_mtu - info->options_len);
c40e89fd35 Alexey Kodanev 2018-04-19  1537  }
c40e89fd35 Alexey Kodanev 2018-04-19  1538  

:::::: The code at line 1519 was first introduced by commit
:::::: c40e89fd358e94a55d6c1475afbea17b5580f601 geneve: configure MTU based on a lower device

:::::: TO: Alexey Kodanev <alexey.kodanev@...cle.com>
:::::: CC: David S. Miller <davem@...emloft.net>

---
0-DAY kernel test infrastructure                Open Source Technology Center
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