tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master head: 8d63ee602da381c437c0a4ef7ea882b71d829eb6 commit: 3873a9a4d8a87d4a15ff0083cf3b173b190c9089 [6/16] sfc: falcon: Read VPD with pci_vpd_alloc() 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 3873a9a4d8a87d4a15ff0083cf3b173b190c9089 # 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 error/warnings (new ones prefixed by >>): In file included from drivers/net/ethernet/sfc/falcon/efx.c:9: In file included from include/linux/pci.h:38: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/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/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/sfc/falcon/efx.c:9: In file included from include/linux/pci.h:38: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/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/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/sfc/falcon/efx.c:9: In file included from include/linux/pci.h:38: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/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/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; ~~~~~~~~~~ ^ vpd_data = pci_vpd_alloc(dev, &vpd_size); ^ vpd_data = pci_vpd_alloc(dev, &vpd_size); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 warnings and 1 error generated. vim +/pci_vpd_alloc +2792 drivers/net/ethernet/sfc/falcon/efx.c 2781 2782 /* NIC VPD information 2783 * Called during probe to display the part number of the installed NIC. 2784 */ 2785 static void ef4_probe_vpd_strings(struct ef4_nic *efx) 2786 { 2787 struct pci_dev *dev = efx->pci_dev; 2788 int ro_start, ro_size, i, j; 2789 unsigned int vpd_size; 2790 u8 *vpd_data; 2791 2793 if (IS_ERR(vpd_data)) { 2794 pci_warn(dev, "Unable to read VPD\n"); 2795 return; 2796 } 2797 2798 /* Get the Read only section */ 2799 ro_start = pci_vpd_find_tag(vpd_data, vpd_size, PCI_VPD_LRDT_RO_DATA); 2800 if (ro_start < 0) { 2801 netif_err(efx, drv, efx->net_dev, "VPD Read-only not found\n"); 2802 goto out; 2803 } 2804 2805 ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); 2806 j = ro_size; 2807 i = ro_start + PCI_VPD_LRDT_TAG_SIZE; 2808 if (i + j > vpd_size) 2809 j = vpd_size - i; 2810 2811 /* Get the Part number */ 2812 i = pci_vpd_find_info_keyword(vpd_data, i, j, "PN"); 2813 if (i < 0) { 2814 netif_err(efx, drv, efx->net_dev, "Part number not found\n"); 2815 goto out; 2816 } 2817 2818 j = pci_vpd_info_field_size(&vpd_data[i]); 2819 i += PCI_VPD_INFO_FLD_HDR_SIZE; 2820 if (i + j > vpd_size) { 2821 netif_err(efx, drv, efx->net_dev, "Incomplete part number\n"); 2822 goto out; 2823 } 2824 2825 netif_info(efx, drv, efx->net_dev, 2826 "Part Number : %.*s\n", j, &vpd_data[i]); 2827 2828 i = ro_start + PCI_VPD_LRDT_TAG_SIZE; 2829 j = ro_size; 2830 i = pci_vpd_find_info_keyword(vpd_data, i, j, "SN"); 2831 if (i < 0) { 2832 netif_err(efx, drv, efx->net_dev, "Serial number not found\n"); 2833 goto out; 2834 } 2835 2836 j = pci_vpd_info_field_size(&vpd_data[i]); 2837 i += PCI_VPD_INFO_FLD_HDR_SIZE; 2838 if (i + j > vpd_size) { 2839 netif_err(efx, drv, efx->net_dev, "Incomplete serial number\n"); 2840 goto out; 2841 } 2842 2843 efx->vpd_sn = kmalloc(j + 1, GFP_KERNEL); 2844 if (!efx->vpd_sn) 2845 goto out; 2846 2847 snprintf(efx->vpd_sn, j + 1, "%s", &vpd_data[i]); 2848 out: 2849 kfree(vpd_data); 2850 } 2851 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org