CC: Linux Memory Management List <linux-mm(a)kvack.org&gt; TO: Dwaipayan Ray <dwaipayanray1(a)gmail.com&gt; CC: Pavel Machek <pavel(a)ucw.cz&gt; CC: Lukas Bulwahn <lukas.bulwahn(a)gmail.com&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 0d52778b8710eb11cb616761a02aee0a7fd60425 commit: 2c64516343af352adb52bb56c10ab02b7b6171df [13536/13785] leds: Use DEVICE_ATTR_{RW, RO, WO} macros config: riscv-randconfig-r014-20201217 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45) 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/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 2c64516343af352adb52bb56c10ab02b7b6171df # 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; Note: the linux-next/master HEAD 0d52778b8710eb11cb616761a02aee0a7fd60425 builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inb' #define inb(c) ({ u8 __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:87:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ drivers/hwmon/pc87427.c:311:24: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] data->temp_crit[nr] = inb(iobase + PC87427_REG_TEMP_CRIT); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inb' #define inb(c) ({ u8 __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:87:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ drivers/hwmon/pc87427.c:312:24: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] data->temp_type[nr] = inb(iobase + PC87427_REG_TEMP_TYPE); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inb' #define inb(c) ({ u8 __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:87:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ drivers/hwmon/pc87427.c:313:26: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] data->temp_status[nr] = inb(iobase + PC87427_REG_TEMP_STATUS); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inb' #define inb(c) ({ u8 __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) ~~~~~~~~~~ ^ arch/riscv/include/asm/mmio.h:87:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ drivers/hwmon/pc87427.c:315:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(data->temp_status[nr], iobase + PC87427_REG_TEMP_STATUS); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: 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))) ^ drivers/hwmon/pc87427.c:438:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(BANK_FM(nr), iobase + PC87427_REG_BANK); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: 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))) ^ drivers/hwmon/pc87427.c:444:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(0, iobase + PC87427_REG_FAN_STATUS); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: 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))) ^ drivers/hwmon/pc87427.c:446:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outw(data->fan_min[nr], iobase + PC87427_REG_FAN_MIN); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:60:68: 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))) ^ drivers/hwmon/pc87427.c:447:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(FAN_STATUS_MONEN, iobase + PC87427_REG_FAN_STATUS); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: 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))) ^ drivers/hwmon/pc87427.c:561:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(data->pwm_enable[nr], iobase + PC87427_REG_PWM_ENABLE); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: 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))) ^ drivers/hwmon/pc87427.c:648:3: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outb(val, iobase + PC87427_REG_PWM_DUTY); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:59:68: 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))) ^ 40 warnings generated. /tmp/pc87427-805080.s: Assembler messages: /tmp/pc87427-805080.s:152: Error: unrecognized opcode `zext.b a0,a0' /tmp/pc87427-805080.s:315: Error: unrecognized opcode `zext.b a1,a1' /tmp/pc87427-805080.s:375: Error: unrecognized opcode `zext.b a1,a1' /tmp/pc87427-805080.s:506: Error: unrecognized opcode `zext.b a1,a1' /tmp/pc87427-805080.s:2503: Error: unrecognized opcode `zext.b a1,a1' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org