tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master head: 8d63ee602da381c437c0a4ef7ea882b71d829eb6 commit: 96ce96f151261e33a170cecb8a4fa664b45743ab [14/16] cxgb4: Validate VPD checksum with pci_vpd_check_csum() config: riscv-randconfig-r014-20210822 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 79b55e5038324e61a3abf4e6a9a949c473edd858) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit... git remote add net-next https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git git fetch --no-tags net-next master git checkout 96ce96f151261e33a170cecb8a4fa664b45743ab # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 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 >>): In file included from drivers/net/ethernet/chelsio/cxgb4/t4_hw.c:36: In file included from drivers/net/ethernet/chelsio/cxgb4/cxgb4.h:42: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:464:31: 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:477:61: 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:36:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from drivers/net/ethernet/chelsio/cxgb4/t4_hw.c:36: In file included from drivers/net/ethernet/chelsio/cxgb4/cxgb4.h:42: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:490:61: 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:34:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from drivers/net/ethernet/chelsio/cxgb4/t4_hw.c:36: In file included from drivers/net/ethernet/chelsio/cxgb4/cxgb4.h:42: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:501:33: 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:511:59: 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:521:59: 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); ~~~~~~~~~~ ^ include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ ret = pci_vpd_check_csum(vpd, VPD_LEN); ^ 7 warnings and 1 error generated. vim +/pci_vpd_check_csum +2803 drivers/net/ethernet/chelsio/cxgb4/t4_hw.c 2802 2804 if (ret) { 2805 dev_err(adapter->pdev_dev, "VPD checksum incorrect or missing\n"); 2806 ret = -EINVAL; 2807 goto out; 2808 } 2809 2810 FIND_VPD_KW(ec, "EC"); 2811 FIND_VPD_KW(sn, "SN"); 2812 FIND_VPD_KW(pn, "PN"); 2813 FIND_VPD_KW(na, "NA"); 2814 #undef FIND_VPD_KW 2815 2816 memcpy(p->id, vpd + PCI_VPD_LRDT_TAG_SIZE, id_len); 2817 strim(p->id); 2818 memcpy(p->ec, vpd + ec, EC_LEN); 2819 strim(p->ec); 2820 i = pci_vpd_info_field_size(vpd + sn - PCI_VPD_INFO_FLD_HDR_SIZE); 2821 memcpy(p->sn, vpd + sn, min(i, SERNUM_LEN)); 2822 strim(p->sn); 2823 i = pci_vpd_info_field_size(vpd + pn - PCI_VPD_INFO_FLD_HDR_SIZE); 2824 memcpy(p->pn, vpd + pn, min(i, PN_LEN)); 2825 strim(p->pn); 2826 memcpy(p->na, vpd + na, min(i, MACADDR_LEN)); 2827 strim((char *)p->na); 2828 2829 out: 2830 vfree(vpd); 2831 return ret < 0 ? ret : 0; 2832 } 2833 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org