linux-kernel - Re: [PATCH net-next v2] bridge: multicast to unicast

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Date:   Wed, 18 Jan 2017 13:59:19 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Linus Lüssing <linus.luessing@...3.blue>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Felix Fietkau <nbd@....name>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        Linus Lüssing <linus.luessing@...3.blue>
Subject: Re: [PATCH net-next v2] bridge: multicast to unicast

Hi Felix,

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Linus-L-ssing/bridge-multicast-to-unicast/20170118-120345
config: x86_64-rhel-7.2 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   net/bridge/br_forward.c: In function 'br_multicast_flood':
>> net/bridge/br_forward.c:261:27: warning: 'port' may be used uninitialized in this function [-Wmaybe-uninitialized]
      struct net_bridge_port *port, *lport, *rport;
                              ^~~~

vim +/port +261 net/bridge/br_forward.c

5cb5e947 Herbert Xu          2010-02-27  245  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
5cb5e947 Herbert Xu          2010-02-27  246  /* called with rcu_read_lock */
37b090e6 Nikolay Aleksandrov 2016-07-14  247  void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
b35c5f63 Nikolay Aleksandrov 2016-07-14  248  			struct sk_buff *skb,
37b090e6 Nikolay Aleksandrov 2016-07-14  249  			bool local_rcv, bool local_orig)
5cb5e947 Herbert Xu          2010-02-27  250  {
5cb5e947 Herbert Xu          2010-02-27  251  	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
1080ab95 Nikolay Aleksandrov 2016-06-28  252  	u8 igmp_type = br_multicast_igmp_type(skb);
5cb5e947 Herbert Xu          2010-02-27  253  	struct net_bridge *br = netdev_priv(dev);
afe0159d stephen hemminger   2010-04-27  254  	struct net_bridge_port *prev = NULL;
5cb5e947 Herbert Xu          2010-02-27  255  	struct net_bridge_port_group *p;
5cb5e947 Herbert Xu          2010-02-27  256  	struct hlist_node *rp;
5cb5e947 Herbert Xu          2010-02-27  257  
e8051688 Eric Dumazet        2010-11-15  258  	rp = rcu_dereference(hlist_first_rcu(&br->router_list));
83f6a740 stephen hemminger   2010-04-27  259  	p = mdst ? rcu_dereference(mdst->ports) : NULL;
5cb5e947 Herbert Xu          2010-02-27  260  	while (p || rp) {
afe0159d stephen hemminger   2010-04-27 @261  		struct net_bridge_port *port, *lport, *rport;
afe0159d stephen hemminger   2010-04-27  262  
5cb5e947 Herbert Xu          2010-02-27  263  		lport = p ? p->port : NULL;
5cb5e947 Herbert Xu          2010-02-27  264  		rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
5cb5e947 Herbert Xu          2010-02-27  265  			     NULL;
5cb5e947 Herbert Xu          2010-02-27  266  
507962cd Felix Fietkau       2017-01-17  267  		if ((unsigned long)lport > (unsigned long)rport) {
507962cd Felix Fietkau       2017-01-17  268  			if (p->flags & MDB_PG_FLAGS_MCAST_TO_UCAST) {
507962cd Felix Fietkau       2017-01-17  269  				maybe_deliver_addr(lport, skb, p->eth_addr,

:::::: The code at line 261 was first introduced by commit
:::::: afe0159d935ab731c682e811356914bb2be9470c bridge: multicast_flood cleanup

:::::: TO: stephen hemminger <shemminger@...tta.com>
:::::: CC: David S. Miller <davem@...emloft.net>

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