Hi Yimin, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 44bf136283e567b2b62653be7630e7511da41da2 commit: b5e2c507b06c9d36411845149162a804ae7b04a9 [6260/13289] riscv: Kconfig: Allow RV32 to build with no MMU config: riscv-randconfig-r024-20230421 (https://download.01.org/0day-ci/archive/20230422/202304220118.NYuW8ip0-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 437b7602e4a998220871de78afcb020b9c14a661) 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-riscv-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b5e2c507b06c9d36411845149162a804ae7b04a9 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 b5e2c507b06c9d36411845149162a804ae7b04a9 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/net/arcnet/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202304220118.NYuW8ip0-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from include/linux/highmem.h:12: 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:751:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] insw(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw' #define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from drivers/net/arcnet/com20020.c:37: In file included from include/linux/netdevice.h:38: In file included from include/net/net_namespace.h:43: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: 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:759:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] insl(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl' #define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from drivers/net/arcnet/com20020.c:37: In file included from include/linux/netdevice.h:38: In file included from include/net/net_namespace.h:43: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: 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:768:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsb(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb' #define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from drivers/net/arcnet/com20020.c:37: In file included from include/linux/netdevice.h:38: In file included from include/net/net_namespace.h:43: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: 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:777:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsw(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw' #define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from drivers/net/arcnet/com20020.c:37: In file included from include/linux/netdevice.h:38: In file included from include/net/net_namespace.h:43: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: 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:786:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsl(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl' #define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from drivers/net/arcnet/com20020.c:37: In file included from include/linux/netdevice.h:38: In file included from include/net/net_namespace.h:43: In file included from include/linux/skbuff.h:17: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: 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:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ >> drivers/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/arcnet/arcdevice.h:389:2: note: expanded from macro 'arcnet_insb' insb((addr) + BUS_ALIGN * (offset), buffer, count) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb' #define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ drivers/net/arcnet/arcdevice.h:103:3: note: expanded from macro 'TIME' call; \ ^~~~ >> drivers/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/arcnet/arcdevice.h:389:2: note: expanded from macro 'arcnet_insb' insb((addr) + BUS_ALIGN * (offset), buffer, count) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb' #define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ drivers/net/arcnet/arcdevice.h:110:3: note: expanded from macro 'TIME' call; \ ^~~~ drivers/net/arcnet/com20020.c:88:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/arcnet/arcdevice.h:391:2: note: expanded from macro 'arcnet_outsb' outsb((addr) + BUS_ALIGN * (offset), buffer, count) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb' #define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ drivers/net/arcnet/arcdevice.h:103:3: note: expanded from macro 'TIME' call; \ ^~~~ drivers/net/arcnet/com20020.c:88:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/arcnet/arcdevice.h:391:2: note: expanded from macro 'arcnet_outsb' outsb((addr) + BUS_ALIGN * (offset), buffer, count) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb' #define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ drivers/net/arcnet/arcdevice.h:110:3: note: expanded from macro 'TIME' call; \ ^~~~ 17 warnings generated. vim +74 drivers/net/arcnet/com20020.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 61 ^1da177e4c3f41 Linus Torvalds 2005-04-16 62 static void com20020_copy_from_card(struct net_device *dev, int bufnum, ^1da177e4c3f41 Linus Torvalds 2005-04-16 63 int offset, void *buf, int count) ^1da177e4c3f41 Linus Torvalds 2005-04-16 64 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 65 int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset; ^1da177e4c3f41 Linus Torvalds 2005-04-16 66 ^1da177e4c3f41 Linus Torvalds 2005-04-16 67 /* set up the address register */ 0fec65130b9f11 Joe Perches 2015-05-05 68 arcnet_outb((ofs >> 8) | RDDATAflag | AUTOINCflag, 0fec65130b9f11 Joe Perches 2015-05-05 69 ioaddr, COM20020_REG_W_ADDR_HI); 0fec65130b9f11 Joe Perches 2015-05-05 70 arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO); ^1da177e4c3f41 Linus Torvalds 2005-04-16 71 ^1da177e4c3f41 Linus Torvalds 2005-04-16 72 /* copy the data */ 0fec65130b9f11 Joe Perches 2015-05-05 73 TIME(dev, "insb", count, 0fec65130b9f11 Joe Perches 2015-05-05 @74 arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 75 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 76 :::::: The code at line 74 was first introduced by commit :::::: 0fec65130b9f11a73d74f47025491f97f82ba070 arcnet: com20020: Use arcnet_<I/O> routines :::::: TO: Joe Perches <joe@xxxxxxxxxxx> :::::: CC: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
