Hi Paolo, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on net/master] [also build test WARNING on net-next/master ipvs/master linus/master v5.13 next-20210709] [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/Paolo-Abeni/veth-more-flexible-c... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 2b452550a203d88112eaf0ba9fc4b750a000b496 config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/e778921949f8b7c673639dbf5bcf7d4f2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Paolo-Abeni/veth-more-flexible-channels-number-configuration/20210709-174314 git checkout e778921949f8b7c673639dbf5bcf7d4f22b7567b # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 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 >>) drivers/net/veth.c:259:37: sparse: expected struct net_device const *dev drivers/net/veth.c:259:37: sparse: got struct net_device [noderef] __rcu *peer drivers/net/veth.c:260:56: sparse: sparse: dereference of noderef expression vim +259 drivers/net/veth.c 237 238 static int veth_set_channels(struct net_device *dev, 239 struct ethtool_channels *ch) 240 { 241 struct veth_priv *priv = netdev_priv(dev); 242 struct veth_priv *peer_priv; 243 244 /* accept changes only on rx/tx */ 245 if (ch->combined_count != min(dev->real_num_rx_queues, dev->real_num_tx_queues)) 246 return -EINVAL; 247 248 /* respect contraint posed at device creation time */ 249 if (ch->rx_count > dev->num_rx_queues || ch->tx_count > dev->num_tx_queues) 250 return -EINVAL; 251 252 if (!ch->rx_count || !ch->tx_count) 253 return -EINVAL; 254 255 /* avoid braking XDP, if that is enabled */ 257 return -EINVAL; 258 260 if (peer_priv->_xdp_prog && ch->tx_count > priv->peer->real_num_rx_queues) 261 return -EINVAL; 262 263 if (netif_running(dev)) 264 veth_close(dev); 265 266 priv->num_tx_queues = ch->tx_count; 267 priv->num_rx_queues = ch->rx_count; 268 269 if (netif_running(dev)) 270 veth_open(dev); 271 return 0; 272 } 273 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org