Hi Samuel, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: e0756cfc7d7cd08c98a53b6009c091a3f6a50be6 commit: 2067fd92d75b6d9085a43caf050bca5d88c491b8 staging/speakup: Move out of staging date: 7 months ago config: riscv-randconfig-r006-20210211 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 2067fd92d75b6d9085a43caf050bca5d88c491b8 # 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 drivers/accessibility/speakup/speakup_acntpc.c:19: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:556:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return inb(addr); ^~~~~~~~~ arch/riscv/include/asm/io.h:54:76: 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:93:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ In file included from drivers/accessibility/speakup/speakup_acntpc.c:19: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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: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:94:76: 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/accessibility/speakup/speakup_acntpc.c:19: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:95:76: 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/accessibility/speakup/speakup_acntpc.c:19: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:97:52: note: expanded from macro 'writeb_cpu' #define writeb_cpu(v, c) ((void)__raw_writeb((v), (c))) ^ In file included from drivers/accessibility/speakup/speakup_acntpc.c:19: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:98:76: 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/accessibility/speakup/speakup_acntpc.c:19: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:99:76: 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/accessibility/speakup/speakup_acntpc.c:19: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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; ~~~~~~~~~~ ^ port_val = inw(speakup_info.port_tts - 1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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:94:76: 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)) ^ drivers/accessibility/speakup/speakup_acntpc.c:273:15: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] port_val = inw(synth_portlist[i]) & 0xfffc; ^~~~~~~~~~~~~~~~~~~~~~ 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:94:76: 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)) ^ 9 warnings generated. -- In file included from drivers/accessibility/speakup/speakup_dtlk.c:18: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:556:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return inb(addr); ^~~~~~~~~ arch/riscv/include/asm/io.h:54:76: 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:93:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ In file included from drivers/accessibility/speakup/speakup_dtlk.c:18: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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: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:94:76: 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/accessibility/speakup/speakup_dtlk.c:18: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:95:76: 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/accessibility/speakup/speakup_dtlk.c:18: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:97:52: note: expanded from macro 'writeb_cpu' #define writeb_cpu(v, c) ((void)__raw_writeb((v), (c))) ^ In file included from drivers/accessibility/speakup/speakup_dtlk.c:18: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:98:76: 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/accessibility/speakup/speakup_dtlk.c:18: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:99:76: 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/accessibility/speakup/speakup_dtlk.c:18: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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; ~~~~~~~~~~ ^ port_val = inw(speakup_info.port_tts - 1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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:94:76: 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)) ^ drivers/accessibility/speakup/speakup_dtlk.c:341:15: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] port_val = inw(synth_portlist[i]) & 0xfbff; ^~~~~~~~~~~~~~~~~~~~~~ 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:94:76: 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)) ^ 9 warnings generated. -- In file included from drivers/accessibility/speakup/speakup_keypc.c:17: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:556:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return inb(addr); ^~~~~~~~~ arch/riscv/include/asm/io.h:54:76: 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:93:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ In file included from drivers/accessibility/speakup/speakup_keypc.c:17: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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: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:94:76: 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/accessibility/speakup/speakup_keypc.c:17: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:95:76: 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/accessibility/speakup/speakup_keypc.c:17: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:97:52: note: expanded from macro 'writeb_cpu' #define writeb_cpu(v, c) ((void)__raw_writeb((v), (c))) ^ In file included from drivers/accessibility/speakup/speakup_keypc.c:17: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:98:76: 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/accessibility/speakup/speakup_keypc.c:17: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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:99:76: 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/accessibility/speakup/speakup_keypc.c:17: In file included from drivers/accessibility/speakup/spk_priv.h:16: In file included from drivers/accessibility/speakup/spk_types.h:17: 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; ~~~~~~~~~~ ^ port_val = inb(synth_port); ^~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:54:76: 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:93:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ drivers/accessibility/speakup/speakup_keypc.c:278:15: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] port_val = inb(synth_portlist[i]); ^~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:54:76: 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:93:48: note: expanded from macro 'readb_cpu' #define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; }) ^ 9 warnings generated. .. vim +262 drivers/accessibility/speakup/speakup_acntpc.c c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 246 c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 247 static int synth_probe(struct spk_synth *synth) c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 248 { c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 249 unsigned int port_val = 0; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 250 int i = 0; 8e69a811068657 drivers/staging/speakup/speakup_acntpc.c Domagoj Trsan 2014-09-09 251 c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 252 pr_info("Probing for %s.\n", synth->long_name); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 253 if (port_forced) { c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 254 speakup_info.port_tts = port_forced; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 255 pr_info("probe forced to %x by kernel command line\n", c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 256 speakup_info.port_tts); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 257 if (synth_request_region(speakup_info.port_tts - 1, c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 258 SYNTH_IO_EXTENT)) { c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 259 pr_warn("sorry, port already reserved\n"); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 260 return -EBUSY; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 261 } c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 @262 port_val = inw(speakup_info.port_tts - 1); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 263 synth_port_control = speakup_info.port_tts - 1; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 264 } else { c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 265 for (i = 0; synth_portlist[i]; i++) { c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 266 if (synth_request_region(synth_portlist[i], c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 267 SYNTH_IO_EXTENT)) { bf4a4bacb051c2 drivers/staging/speakup/speakup_acntpc.c Christopher Brannon 2010-10-14 268 pr_warn bf4a4bacb051c2 drivers/staging/speakup/speakup_acntpc.c Christopher Brannon 2010-10-14 269 ("request_region: failed with 0x%x, %d\n", c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 270 synth_portlist[i], SYNTH_IO_EXTENT); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 271 continue; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 272 } c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 273 port_val = inw(synth_portlist[i]) & 0xfffc; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 274 if (port_val == 0x53fc) { c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 275 /* 'S' and out&input bits */ c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 276 synth_port_control = synth_portlist[i]; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 277 speakup_info.port_tts = synth_port_control + 1; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 278 break; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 279 } c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 280 } c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 281 } c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 282 port_val &= 0xfffc; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 283 if (port_val != 0x53fc) { c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 284 /* 'S' and out&input bits */ c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 285 pr_info("%s: not found\n", synth->long_name); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 286 synth_release_region(synth_port_control, SYNTH_IO_EXTENT); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 287 synth_port_control = 0; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 288 return -ENODEV; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 289 } c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 290 pr_info("%s: %03x-%03x, driver version %s,\n", synth->long_name, c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 291 synth_port_control, synth_port_control + SYNTH_IO_EXTENT - 1, c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 292 synth->version); c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 293 synth->alive = 1; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 294 return 0; c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 295 } c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 296 :::::: The code at line 262 was first introduced by commit :::::: c6e3fd22cd538365bfeb82997d5b89562e077d42 Staging: add speakup to the staging directory :::::: TO: William Hubbs <w.d.hubbs(a)gmail.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org