[android-common:android-4.19 3/6] net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:245:1: warning: no previous prototype for 'nf_nat_ipv4_fn'

[android-common:android-4.19 3/6] net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:245:1: warning: no previous prototype for 'nf_nat_ipv4_fn'

[kbuild test robot]

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tree:   https://android.googlesource.com/kernel/common android-4.19
head:   c49ad139b66a557a1c410230bec62498bab955ad
commit: f0723e3bd598d138a44d342818032e89ed2e11a5 [3/6] ANDROID: netfilter: nf_nat: remove static from nf_nat_ipv4_fn
config: i386-randconfig-a015-20200529 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce (this is a W=1 build):
        git checkout f0723e3bd598d138a44d342818032e89ed2e11a5
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:245:1: warning: no previous prototype for 'nf_nat_ipv4_fn' [-Wmissing-prototypes]
nf_nat_ipv4_fn(void *priv, struct sk_buff *skb,
^~~~~~~~~~~~~~

vim +/nf_nat_ipv4_fn +245 net/ipv4/netfilter/nf_nat_l3proto_ipv4.c

c7232c9979cba6 Patrick McHardy   2012-08-26  243  
f0723e3bd598d1 Sami Tolvanen     2019-12-06  244  unsigned int
06198b34a3e09e Eric W. Biederman 2015-09-18 @245  nf_nat_ipv4_fn(void *priv, struct sk_buff *skb,
9971a514ed2697 Florian Westphal  2018-05-14  246  	       const struct nf_hook_state *state)
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  247  {
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  248  	struct nf_conn *ct;
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  249  	enum ip_conntrack_info ctinfo;
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  250  
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  251  	ct = nf_ct_get(skb, &ctinfo);
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  252  	if (!ct)
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  253  		return NF_ACCEPT;
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  254  
1f55236bd8dde6 Florian Westphal  2018-05-14  255  	if (ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY) {
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  256  		if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  257  			if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
082a758f042e1c Eric W. Biederman 2015-09-18  258  							   state->hook))
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  259  				return NF_DROP;
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  260  			else
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  261  				return NF_ACCEPT;
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  262  		}
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  263  	}
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  264  
9971a514ed2697 Florian Westphal  2018-05-14  265  	return nf_nat_inet_fn(priv, skb, state);
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  266  }
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  267  EXPORT_SYMBOL_GPL(nf_nat_ipv4_fn);
30766f4c2d60dd Pablo Neira Ayuso 2014-08-05  268  

:::::: The code at line 245 was first introduced by commit
:::::: 06198b34a3e09e06d9aecaa3727e0d37206cea77 netfilter: Pass priv instead of nf_hook_ops to netfilter hooks

:::::: TO: Eric W. Biederman <ebiederm@xmission.com>
:::::: CC: Pablo Neira Ayuso <pablo@netfilter.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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