netdev - [net-next:master 414/428] net/ipv6/tcp_ipv6.c:930: warning: passing argument 1 of 'tcp_v6_md5_do_lookup' discards qualifiers from pointer target type

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Date:	Wed, 30 Sep 2015 12:01:46 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	kbuild-all@...org, netdev@...r.kernel.org
Subject: [net-next:master 414/428] net/ipv6/tcp_ipv6.c:930: warning: passing
 argument 1 of 'tcp_v6_md5_do_lookup' discards qualifiers from pointer target
 type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   e6934f3ec00b04234acb24a1a2c28af59763d3b5
commit: a00e74442bac5ad19a929d097370da7e07540ea6 [414/428] tcp/dccp: constify send_synack and send_reset socket argument
config: avr32-atngw100_defconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout a00e74442bac5ad19a929d097370da7e07540ea6
  # save the attached .config to linux build tree
  make.cross ARCH=avr32 

All warnings (new ones prefixed by >>):

   net/ipv6/tcp_ipv6.c: In function 'tcp_v6_reqsk_send_ack':
>> net/ipv6/tcp_ipv6.c:930: warning: passing argument 1 of 'tcp_v6_md5_do_lookup' discards qualifiers from pointer target type
   net/ipv6/tcp_ipv6.c:926: warning: passing argument 1 of 'tcp_v6_md5_do_lookup' discards qualifiers from pointer target type

vim +/tcp_v6_md5_do_lookup +930 net/ipv6/tcp_ipv6.c

9c76a114b Wang Yufen               2014-03-29  914  			tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
21858cd02 Florent Fourcot          2015-05-16  915  			tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel));
^1da177e4 Linus Torvalds           2005-04-16  916  
8feaf0c0a Arnaldo Carvalho de Melo 2005-08-09  917  	inet_twsk_put(tw);
^1da177e4 Linus Torvalds           2005-04-16  918  }
^1da177e4 Linus Torvalds           2005-04-16  919  
a00e74442 Eric Dumazet             2015-09-29  920  static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
6edafaaf6 Gui Jianfeng             2008-08-06  921  				  struct request_sock *req)
^1da177e4 Linus Torvalds           2005-04-16  922  {
3a19ce0ee Daniel Lee               2014-05-11  923  	/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
3a19ce0ee Daniel Lee               2014-05-11  924  	 * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
3a19ce0ee Daniel Lee               2014-05-11  925  	 */
0f85feae6 Eric Dumazet             2014-12-09  926  	tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
3a19ce0ee Daniel Lee               2014-05-11  927  			tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
0f85feae6 Eric Dumazet             2014-12-09  928  			tcp_rsk(req)->rcv_nxt, req->rcv_wnd,
0f85feae6 Eric Dumazet             2014-12-09  929  			tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if,
1d13a96c7 Florent Fourcot          2014-01-16 @930  			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr),
1d13a96c7 Florent Fourcot          2014-01-16  931  			0, 0);
^1da177e4 Linus Torvalds           2005-04-16  932  }
^1da177e4 Linus Torvalds           2005-04-16  933  
^1da177e4 Linus Torvalds           2005-04-16  934  
^1da177e4 Linus Torvalds           2005-04-16  935  static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb)
^1da177e4 Linus Torvalds           2005-04-16  936  {
aa8223c7b Arnaldo Carvalho de Melo 2007-04-10  937  	const struct tcphdr *th = tcp_hdr(skb);
52452c542 Eric Dumazet             2015-03-19  938  	struct request_sock *req;

:::::: The code at line 930 was first introduced by commit
:::::: 1d13a96c74fc4802a775189ddb58bc6469ffdaa3 ipv6: tcp: fix flowlabel value in ACK messages send from TIME_WAIT

:::::: TO: Florent Fourcot <florent.fourcot@...t-bretagne.fr>
:::::: CC: David S. Miller <davem@...emloft.net>

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