From: kernel test robot <lkp@intel.com>
To: Kris Van Hees <kris.van.hees@oracle.com>
Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
Nick Alcock <nick.alcock@oracle.com>,
Tomas Jedlicka <tomas.jedlicka@oracle.com>,
Eugene Loh <eugene.loh@oracle.com>,
Alan Maguire <alan.maguire@oracle.com>,
David Mc Lean <david.mclean@oracle.com>,
Vincent Lim <vincent.lim@oracle.com>
Subject: [oracle-dtrace:v1/5.15 30/35] net/ipv6/ip6_output.c:69:21: warning: variable 'dropreason' set but not used
Date: Tue, 9 Nov 2021 19:40:13 +0800 [thread overview]
Message-ID: <202111091903.szcR5o5V-lkp@intel.com> (raw)
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tree: https://github.com/oracle/dtrace-linux-kernel v1/5.15
head: 0fee66d7ce96317146609675767971d0f35c3e74
commit: 7ed2333cfd691c676b0adfe951d92244f1ef5128 [30/35] dtrace: add SDT probes
config: csky-defconfig (attached as .config)
compiler: csky-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/oracle/dtrace-linux-kernel/commit/7ed2333cfd691c676b0adfe951d92244f1ef5128
git remote add oracle-dtrace https://github.com/oracle/dtrace-linux-kernel
git fetch --no-tags oracle-dtrace v1/5.15
git checkout 7ed2333cfd691c676b0adfe951d92244f1ef5128
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=csky
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
net/ipv6/ip6_output.c: In function 'ip6_finish_output2':
>> net/ipv6/ip6_output.c:69:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
69 | const char *dropreason;
| ^~~~~~~~~~
net/ipv6/ip6_output.c: In function 'ip6_xmit':
net/ipv6/ip6_output.c:291:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
291 | const char *dropreason;
| ^~~~~~~~~~
net/ipv6/ip6_output.c: In function 'ip6_forward':
>> net/ipv6/ip6_output.c:536:13: warning: variable 'err' set but not used [-Wunused-but-set-variable]
536 | int err = -EINVAL;
| ^~~
net/ipv6/ip6_output.c:535:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
535 | const char *dropreason;
| ^~~~~~~~~~
net/ipv6/ip6_output.c: In function '__ip6_append_data':
net/ipv6/ip6_output.c:1547:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
1547 | const char *dropreason;
| ^~~~~~~~~~
--
net/ipv6/ip6_input.c: In function 'ip6_rcv_core':
>> net/ipv6/ip6_input.c:152:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
152 | const char *dropreason;
| ^~~~~~~~~~
net/ipv6/ip6_input.c: In function 'ip6_protocol_deliver_rcu':
net/ipv6/ip6_input.c:389:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
389 | const char *dropreason;
| ^~~~~~~~~~
net/ipv6/ip6_input.c: In function 'ip6_input':
net/ipv6/ip6_input.c:526:25: warning: unused variable 'hdr' [-Wunused-variable]
526 | struct ipv6hdr *hdr = ipv6_hdr(skb);
| ^~~
--
net/ipv6/raw.c: In function 'rawv6_send_hdrinc':
>> net/ipv6/raw.c:631:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
631 | const char *dropreason;
| ^~~~~~~~~~
--
net/ipv6/mcast.c: In function 'mld_sendpack':
>> net/ipv6/mcast.c:1796:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
1796 | const char *dropreason;
| ^~~~~~~~~~
net/ipv6/mcast.c: In function 'igmp6_send':
net/ipv6/mcast.c:2167:21: warning: variable 'dropreason' set but not used [-Wunused-but-set-variable]
2167 | const char *dropreason;
| ^~~~~~~~~~
vim +/dropreason +69 net/ipv6/ip6_output.c
59
60 static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
61 {
62 struct dst_entry *dst = skb_dst(skb);
63 struct net_device *dev = dst->dev;
64 struct inet6_dev *idev = ip6_dst_idev(dst);
65 unsigned int hh_len = LL_RESERVED_SPACE(dev);
66 const struct in6_addr *daddr, *nexthop;
67 struct ipv6hdr *hdr;
68 struct neighbour *neigh;
> 69 const char *dropreason;
70 int ret = 0;
71
72 /* Be paranoid, rather than too clever. */
73 if (unlikely(hh_len > skb_headroom(skb)) && dev->header_ops) {
74 skb = skb_expand_head(skb, hh_len);
75 if (!skb)
76 goto oom;
77 }
78
79 hdr = ipv6_hdr(skb);
80 daddr = &hdr->daddr;
81 if (ipv6_addr_is_multicast(daddr)) {
82 if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
83 ((mroute6_is_socket(net, skb) &&
84 !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
85 ipv6_chk_mcast_addr(dev, daddr, &hdr->saddr))) {
86 struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
87
88 /* Do not check for IFF_ALLMULTI; multicast routing
89 is not supported in any case.
90 */
91 if (newskb)
92 NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
93 net, sk, newskb, NULL, newskb->dev,
94 dev_loopback_xmit);
95
96 if (hdr->hop_limit == 0) {
97 dropreason = "hoplimit exceeded";
98
99 IP6_INC_STATS(net, idev,
100 IPSTATS_MIB_OUTDISCARDS);
101 goto drop;
102 }
103 }
104
105 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len);
106 if (IPV6_ADDR_MC_SCOPE(daddr) <= IPV6_ADDR_SCOPE_NODELOCAL &&
107 !(dev->flags & IFF_LOOPBACK)) {
108 dropreason = "invalid scope";
109 goto drop;
110 }
111 }
112
113 if (lwtunnel_xmit_redirect(dst->lwtstate)) {
114 int res = lwtunnel_xmit(skb);
115
116 if (res < 0 || res == LWTUNNEL_XMIT_DONE)
117 return res;
118 }
119
120 rcu_read_lock_bh();
121 nexthop = rt6_nexthop((struct rt6_info *)dst, daddr);
122 neigh = __ipv6_neigh_lookup_noref(dev, nexthop);
123 if (unlikely(!neigh))
124 neigh = __neigh_create(&nd_tbl, nexthop, dev, false);
125 if (!IS_ERR(neigh)) {
126 sock_confirm_neigh(skb, neigh);
127 ret = neigh_output(neigh, skb, false);
128 rcu_read_unlock_bh();
129 return ret;
130 }
131 rcu_read_unlock_bh();
132
133 dropreason = "no route to host";
134 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTNOROUTES);
135 ret = -EINVAL;
136 drop:
137 DTRACE_IP(drop__out,
138 struct sk_buff * : pktinfo_t *, skb,
139 struct sock * : csinfo_t *, skb->sk,
140 void_ip_t * : ipinfo_t *, ipv6_hdr(skb),
141 struct net_device * : ifinfo_t *, skb->dev,
142 struct iphdr * : ipv4info_t *, NULL,
143 struct ipv6hdr * : ipv6info_t *, ipv6_hdr(skb),
144 const char * : string, dropreason);
145 kfree_skb(skb);
146 return ret;
147 oom:
148 DTRACE_IP(drop__out,
149 struct sk_buff * : pktinfo_t *, NULL,
150 struct sock * : csinfo_t *, NULL,
151 void_ip_t * : ipinfo_t *, NULL,
152 struct net_device * : ifinfo_t *, NULL,
153 struct iphdr * : ipv4info_t *, NULL,
154 struct ipv6hdr * : ipv6info_t *, NULL,
155 const char * : string, "out of memory");
156 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
157 return -ENOMEM;
158
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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