tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git pending-4.19 head: da0ab6f9b4814a4a16e1999273d7dbd1a348314b commit: f6ed8abfa222990685b78e1d3e6df3bca8efbf31 [48/61] ipv4: Fix device used for dst_alloc with local routes config: x86_64-randconfig-a002-20210620 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d1baf2895467735ab14f4b3415fce204c0cc8e7f) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable pending-4.19 git checkout f6ed8abfa222990685b78e1d3e6df3bca8efbf31 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): net/ipv4/route.c:870:6: warning: variable 'log_martians' set but not used [-Wunused-but-set-variable] int log_martians; ^ struct fib_nh_common *nhc = res->fi ? res->nhc : NULL; ~~~ ^ dev = l3mdev_master_dev_rcu(nhc->nhc_dev); ~~~^ net/ipv4/route.c:1988:9: note: forward declaration of 'struct fib_nh_common' struct fib_nh_common *nhc = res->fi ? res->nhc : NULL; ^ 1 warning and 2 errors generated. vim +1988 net/ipv4/route.c 1983 1984 /* get device for dst_alloc with local routes */ 1985 static struct net_device *ip_rt_get_dev(struct net *net, 1986 const struct fib_result *res) 1987 { 1989 struct net_device *dev = NULL; 1990 1991 if (nhc) 1993 1994 return dev ? : net->loopback_dev; 1995 } 1996 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org