Hi, Thank you for the patch! Yet something to improve: [auto build test ERROR on net-next/master] [also build test ERROR on net/master linus/master v5.13-rc7 next-20210622] [cannot apply to sparc-next/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/13145886936-163-com/decnet-af_de... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 38f75922a6905b010f597fc70dbb5db28398728e config: x86_64-randconfig-a001-20210622 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project b259740801d3515810ecc15bf0c24b0d476a1608) 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://github.com/0day-ci/linux/commit/684dced1c59e94a4ef160061073d0cb92... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review 13145886936-163-com/decnet-af_decnet-pmc-should-not-be-referenced-when-it-s-NULL/20210623-113728 git checkout 684dced1c59e94a4ef160061073d0cb928b370e4 # 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 >>): } ^ 1 error generated. vim +1240 net/decnet/af_decnet.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 1203 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1204 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1205 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1206 struct sock *sk = sock->sk; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1207 struct dn_scp *scp = DN_SK(sk); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1208 int err = -EOPNOTSUPP; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1209 long amount = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1210 struct sk_buff *skb; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1211 int val; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1212 684dced1c59e94 gushengxian 2021-06-22 1213 switch (cmd) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1214 case SIOCGIFADDR: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1215 case SIOCSIFADDR: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1216 return dn_dev_ioctl(cmd, (void __user *)arg); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1217 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1218 case SIOCATMARK: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1219 lock_sock(sk); b03efcfb218028 David S. Miller 2005-07-08 1220 val = !skb_queue_empty(&scp->other_receive_queue); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1221 if (scp->state != DN_RUN) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1222 val = -ENOTCONN; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1223 release_sock(sk); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1224 return val; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1225 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1226 case TIOCOUTQ: 31e6d363abcd0d Eric Dumazet 2009-06-17 1227 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1228 if (amount < 0) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1229 amount = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1230 err = put_user(amount, (int __user *)arg); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1231 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1232 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1233 case TIOCINQ: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1234 lock_sock(sk); e57c624be8f99e Hannes Eder 2009-02-25 1235 skb = skb_peek(&scp->other_receive_queue); e57c624be8f99e Hannes Eder 2009-02-25 1236 if (skb) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1237 amount = skb->len; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1238 } else { bec571ec762a4c David S. Miller 2009-05-28 1239 skb_queue_walk(&sk->sk_receive_queue, skb) ^1da177e4c3f41 Linus Torvalds 2005-04-16 @1240 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1241 release_sock(sk); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1242 err = put_user(amount, (int __user *)arg); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1243 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1244 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1245 default: b5e5fa5e093e42 Christoph Hellwig 2006-01-03 1246 err = -ENOIOCTLCMD; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1247 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1248 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1249 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1250 return err; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1251 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1252 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org