Hi Aleksander, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d2f38a3c6507b2520101f9a3807ed98f1bdc545a commit: 14d4e308e0aa0b78dc7a059716861a4380de3535 net: lantiq: configure the burst length in ethernet drivers date: 8 weeks ago config: mips-xway_defconfig (attached as .config) compiler: mips-linux-gcc (GCC) 11.2.0 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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 14d4e308e0aa0b78dc7a059716861a4380de3535 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=mips SHELL=/bin/bash 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 >>): drivers/net/ethernet/lantiq_etop.c: In function 'ltq_etop_hw_init': 265 | ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, rx_burst_len); | ^~~~~~~~~~~~ drivers/net/ethernet/lantiq_etop.c:265:62: note: each undeclared identifier is reported only once for each function it appears in drivers/net/ethernet/lantiq_etop.c: In function 'ltq_etop_probe': 673 | err = device_property_read_u32(&pdev->dev, "lantiq,tx-burst-length", &priv->tx_burst_len); | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/lantiq_etop.c: At top level: drivers/net/ethernet/lantiq_etop.c:730:1: warning: no previous prototype for 'init_ltq_etop' [-Wmissing-prototypes] 730 | init_ltq_etop(void) | ^~~~~~~~~~~~~ drivers/net/ethernet/lantiq_etop.c: In function 'ltq_etop_hw_init': drivers/net/ethernet/lantiq_etop.c:276:25: warning: ignoring return value of 'request_irq' declared with attribute 'warn_unused_result' [-Wunused-result] 276 | request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/lantiq_etop.c:284:25: warning: ignoring return value of 'request_irq' declared with attribute 'warn_unused_result' [-Wunused-result] 284 | request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/rx_burst_len +265 drivers/net/ethernet/lantiq_etop.c 236 237 static int 238 ltq_etop_hw_init(struct net_device *dev) 239 { 240 struct ltq_etop_priv *priv = netdev_priv(dev); 241 int i; 242 243 ltq_pmu_enable(PMU_PPE); 244 245 switch (priv->pldata->mii_mode) { 246 case PHY_INTERFACE_MODE_RMII: 247 ltq_etop_w32_mask(ETOP_MII_MASK, 248 ETOP_MII_REVERSE, LTQ_ETOP_CFG); 249 break; 250 251 case PHY_INTERFACE_MODE_MII: 252 ltq_etop_w32_mask(ETOP_MII_MASK, 253 ETOP_MII_NORMAL, LTQ_ETOP_CFG); 254 break; 255 256 default: 257 netdev_err(dev, "unknown mii mode %d\n", 258 priv->pldata->mii_mode); 259 return -ENOTSUPP; 260 } 261 262 /* enable crc generation */ 263 ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG); 264 266 267 for (i = 0; i < MAX_DMA_CHAN; i++) { 268 int irq = LTQ_DMA_CH0_INT + i; 269 struct ltq_etop_chan *ch = &priv->ch[i]; 270 271 ch->idx = ch->dma.nr = i; 272 ch->dma.dev = &priv->pdev->dev; 273 274 if (IS_TX(i)) { 275 ltq_dma_alloc_tx(&ch->dma); 276 request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv); 277 } else if (IS_RX(i)) { 278 ltq_dma_alloc_rx(&ch->dma); 279 for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM; 280 ch->dma.desc++) 281 if (ltq_etop_alloc_skb(ch)) 282 return -ENOMEM; 283 ch->dma.desc = 0; 284 request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv); 285 } 286 ch->dma.irq = irq; 287 } 288 return 0; 289 } 290 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org