tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git arm-kill-set_fs-5 head: 1086c1cb895540fdf215aecf3ed4a96843d6633e commit: 7c6abb06b21a8c97bae4a330de4a490c5acf0dbf [17/40] scsi: megaraid_sas: simplify compat_ioctl handling config: riscv-randconfig-r031-20200917 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0ff28fa6a75617d61b1aeea77463d6a1684c3c89) 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 git checkout 7c6abb06b21a8c97bae4a330de4a490c5acf0dbf # 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 warnings (new ones prefixed by >>): In file included from arch/riscv/include/asm/io.h:148: include/asm-generic/io.h:564:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return inw(addr); ^~~~~~~~~ arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inw' #define inw(c) ({ u16 __v; __io_pbr(); __v = readw_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:88:76: note: expanded from macro 'readw_cpu' #define readw_cpu(c) ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; }) ^ 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/scsi/megaraid/megaraid_sas_base.c:22: 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:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: 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:148: include/asm-generic/io.h:572:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return inl(addr); ^~~~~~~~~ arch/riscv/include/asm/io.h:56:76: note: expanded from macro 'inl' #define inl(c) ({ u32 __v; __io_pbr(); __v = readl_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:89:76: note: expanded from macro 'readl_cpu' #define readl_cpu(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; }) ^ 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/scsi/megaraid/megaraid_sas_base.c:22: 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:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: 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:148: include/asm-generic/io.h:580:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(value, addr); ^~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb' #define outb(v,c) ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:91:52: note: expanded from macro 'writeb_cpu' #define writeb_cpu(v, c) ((void)__raw_writeb((v), (c))) ^ In file included from drivers/scsi/megaraid/megaraid_sas_base.c:22: 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:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: 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:148: include/asm-generic/io.h:588:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outw(value, addr); ^~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: note: expanded from macro 'outw' #define outw(v,c) ({ __io_pbw(); writew_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:92:76: note: expanded from macro 'writew_cpu' #define writew_cpu(v, c) ((void)__raw_writew((__force u16)cpu_to_le16(v), (c))) ^ In file included from drivers/scsi/megaraid/megaraid_sas_base.c:22: 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:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: 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:148: include/asm-generic/io.h:596:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outl(value, addr); ^~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:60:68: note: expanded from macro 'outl' #define outl(v,c) ({ __io_pbw(); writel_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:93:76: note: expanded from macro 'writel_cpu' #define writel_cpu(v, c) ((void)__raw_writel((__force u32)cpu_to_le32(v), (c))) ^ In file included from drivers/scsi/megaraid/megaraid_sas_base.c:22: 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:10: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:13: 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:148: include/asm-generic/io.h:1017:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ return -ENOMEM; ^~~~~~~ 8 warnings generated. # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground arm-kill-set_fs-5 git checkout 7c6abb06b21a8c97bae4a330de4a490c5acf0dbf vim +8347 drivers/scsi/megaraid/megaraid_sas_base.c 8335 8336 static struct megasas_iocpacket * 8337 megasas_compat_iocpacket_get_user(void __user *arg) 8338 { 8339 struct megasas_iocpacket *ioc; 8340 struct compat_megasas_iocpacket __user *cioc = arg; 8341 size_t size; 8342 int err = -EFAULT; 8343 int i; 8344 8345 ioc = kzalloc(sizeof(*ioc), GFP_KERNEL); 8346 if (!ioc) 8348 size = offsetof(struct megasas_iocpacket, frame) + sizeof(ioc->frame); 8349 if (copy_from_user(ioc, arg, size)) 8350 goto out; 8351 8352 for (i = 0; i < MAX_IOCTL_SGE; i++) { 8353 compat_uptr_t iov_base; 8354 if (get_user(iov_base, &cioc->sgl[i].iov_base) || 8355 get_user(ioc->sgl[i].iov_len, &cioc->sgl[i].iov_len)) { 8356 goto out; 8357 } 8358 ioc->sgl[i].iov_base = compat_ptr(iov_base); 8359 } 8360 8361 return ioc; 8362 out: 8363 kfree(ioc); 8364 8365 return ERR_PTR(err); 8366 } 8367 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org