Hi Shenwei, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net-next/master] [also build test WARNING on net/master linus/master v6.1-rc2 next-20221026] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Shenwei-Wang/net-fec-add-initial-XDP-support/20221026-041331 patch link: https://lore.kernel.org/r/20221025201156.776576-1-shenwei.wang%40nxp.com patch subject: [PATCH 1/1] net: fec: add initial XDP support config: hexagon-randconfig-r033-20221024 (attached as .config) compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920) 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://github.com/intel-lab-lkp/linux/commit/f601d09cdead68e49ba67efbb904277b697c2f66 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Shenwei-Wang/net-fec-add-initial-XDP-support/20221026-041331 git checkout f601d09cdead68e49ba67efbb904277b697c2f66 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/net/ethernet/freescale/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from drivers/net/ethernet/freescale/fec_main.c:33: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from drivers/net/ethernet/freescale/fec_main.c:33: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from drivers/net/ethernet/freescale/fec_main.c:33: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:334: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ >> drivers/net/ethernet/freescale/fec_main.c:3692:9: warning: variable 'nxmit' set but not used [-Wunused-but-set-variable] int i, nxmit = 0; ^ 7 warnings generated. vim +/nxmit +3692 drivers/net/ethernet/freescale/fec_main.c 3681 3682 static int fec_enet_xdp_xmit(struct net_device *dev, 3683 int num_frames, 3684 struct xdp_frame **frames, 3685 u32 flags) 3686 { 3687 struct fec_enet_private *fep = netdev_priv(dev); 3688 struct fec_enet_priv_tx_q *txq; 3689 int cpu = smp_processor_id(); 3690 struct netdev_queue *nq; 3691 unsigned int queue; > 3692 int i, nxmit = 0; 3693 3694 queue = fec_enet_xdp_get_tx_queue(fep, cpu); 3695 txq = fep->tx_queue[queue]; 3696 nq = netdev_get_tx_queue(fep->netdev, queue); 3697 3698 __netif_tx_lock(nq, cpu); 3699 3700 for (i = 0; i < num_frames; i++) { 3701 fec_enet_txq_xmit_frame(fep, txq, frames[i]); 3702 nxmit++; 3703 } 3704 3705 /* Make sure the update to bdp and tx_skbuff are performed. */ 3706 wmb(); 3707 3708 /* Trigger transmission start */ 3709 writel(0, txq->bd.reg_desc_active); 3710 3711 __netif_tx_unlock(nq); 3712 3713 return num_frames; 3714 } 3715 -- 0-DAY CI Kernel Test Service https://01.org/lkp