tree: https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git testing head: 5974dc5581b5ae0ef7bef0916ec99663d4b78c9d commit: cad1b206dc43c9324409af29a0d3eb6dc8fa6a02 [20/27] can: flexcan: flexcan_rx_offload_setup(): factor out mailbox and rx-offload setup into separate function config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 9.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git/co... git remote add mkl-can-next https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git git fetch --no-tags mkl-can-next testing git checkout cad1b206dc43c9324409af29a0d3eb6dc8fa6a02 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/net/can/flexcan.c: In function 'flexcan_rx_offload_setup': 1389 | int err; | ^~~ vim +/err +1389 drivers/net/can/flexcan.c 1385 1386 static int flexcan_rx_offload_setup(struct net_device *dev) 1387 { 1388 struct flexcan_priv *priv = netdev_priv(dev); 1390 1391 if (priv->can.ctrlmode & CAN_CTRLMODE_FD) 1392 priv->mb_size = sizeof(struct flexcan_mb) + CANFD_MAX_DLEN; 1393 else 1394 priv->mb_size = sizeof(struct flexcan_mb) + CAN_MAX_DLEN; 1395 priv->mb_count = (sizeof(priv->regs->mb[0]) / priv->mb_size) + 1396 (sizeof(priv->regs->mb[1]) / priv->mb_size); 1397 1398 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) 1399 priv->tx_mb_reserved = 1400 flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP); 1401 else 1402 priv->tx_mb_reserved = 1403 flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_OFF_FIFO); 1404 priv->tx_mb_idx = priv->mb_count - 1; 1405 priv->tx_mb = flexcan_get_mb(priv, priv->tx_mb_idx); 1406 priv->tx_mask = FLEXCAN_IFLAG_MB(priv->tx_mb_idx); 1407 1408 priv->offload.mailbox_read = flexcan_mailbox_read; 1409 1410 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) { 1411 priv->offload.mb_first = FLEXCAN_RX_MB_OFF_TIMESTAMP_FIRST; 1412 priv->offload.mb_last = priv->mb_count - 2; 1413 1414 priv->rx_mask = GENMASK_ULL(priv->offload.mb_last, 1415 priv->offload.mb_first); 1416 err = can_rx_offload_add_timestamp(dev, &priv->offload); 1417 } else { 1418 priv->rx_mask = FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | 1419 FLEXCAN_IFLAG_RX_FIFO_AVAILABLE; 1420 err = can_rx_offload_add_fifo(dev, &priv->offload, 1421 FLEXCAN_NAPI_WEIGHT); 1422 } 1423 1424 return 0; 1425 } 1426 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org