tree: https://github.com/jpirko/linux_mlxsw net_next_queue head: 4db3a8525898c8f8a5131792f6a03b698df5759e commit: f8610c65010c63c61b6fceee17ae35713272a6b1 [13/38] net: ipv4: Emit notification when fib hardware flags are changed config: powerpc64-randconfig-s032-20210118 (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-208-g46a52ca4-dirty # https://github.com/jpirko/linux_mlxsw/commit/f8610c65010c63c61b6fceee17ae... git remote add jpirko-mlxsw https://github.com/jpirko/linux_mlxsw git fetch --no-tags jpirko-mlxsw net_next_queue git checkout f8610c65010c63c61b6fceee17ae35713272a6b1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" vim +1073 net/ipv4/fib_trie.c 1037 1038 void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri) 1039 { 1040 struct fib_alias *fa_match; 1041 struct sk_buff *skb; 1042 int err; 1043 1044 rcu_read_lock(); 1045 1046 fa_match = fib_find_matching_alias(net, fri); 1047 if (!fa_match) 1048 goto out; 1049 1050 if (fa_match->offload == fri->offload && fa_match->trap == fri->trap) 1051 goto out; 1052 1053 fa_match->offload = fri->offload; 1054 fa_match->trap = fri->trap; 1055 1056 if (!net->ipv4.sysctl_fib_notify_on_flag_change) 1057 goto out; 1058 1059 skb = nlmsg_new(fib_nlmsg_size(fa_match->fa_info), GFP_ATOMIC); 1060 if (!skb) { 1061 err = -ENOBUFS; 1062 goto errout; 1063 } 1064 1065 err = fib_dump_info(skb, 0, 0, RTM_NEWROUTE, fri, 0); 1066 if (err < 0) { 1067 /* -EMSGSIZE implies BUG in fib_nlmsg_size() */ 1068 WARN_ON(err == -EMSGSIZE); 1069 kfree_skb(skb); 1070 goto errout; 1071 } 1072 1074 goto out; 1075 1076 errout: 1077 rtnl_set_sk_err(net, RTNLGRP_IPV4_ROUTE, err); 1078 out: 1079 rcu_read_unlock(); 1080 } 1081 EXPORT_SYMBOL_GPL(fib_alias_hw_flags_set); 1082 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org