Hi "Pavel, Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Pavel-imerda/net-mdio-access-c22-registers-via-debugfs/20210117-053409 base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 9ab7e76aefc97a9aa664accb59d6e8dc5e52514a config: s390-randconfig-r015-20210117 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 2082b10d100e8dbaffc2ba8f497db5d2ab61beb2) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://github.com/0day-ci/linux/commit/22d74f4896850840331d36d6867f7bc5ce728bbd git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Pavel-imerda/net-mdio-access-c22-registers-via-debugfs/20210117-053409 git checkout 22d74f4896850840331d36d6867f7bc5ce728bbd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> All warnings (new ones prefixed by >>): ^ include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ ^ In file included from drivers/net/phy/mdio-debugfs.c:3: In file included from include/linux/phy.h:16: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ ^ In file included from drivers/net/phy/mdio-debugfs.c:3: In file included from include/linux/phy.h:16: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0xff000000UL) >> 24))) ^ In file included from drivers/net/phy/mdio-debugfs.c:3: In file included from include/linux/phy.h:16: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32' __fswab32(x)) ^ In file included from drivers/net/phy/mdio-debugfs.c:3: In file included from include/linux/phy.h:16: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: 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:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ >> drivers/net/phy/mdio-debugfs.c:170:6: warning: no previous prototype for >> function 'mdio_debugfs_add' [-Wmissing-prototypes] void mdio_debugfs_add(struct mii_bus *bus) ^ drivers/net/phy/mdio-debugfs.c:170:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void mdio_debugfs_add(struct mii_bus *bus) ^ static >> drivers/net/phy/mdio-debugfs.c:177:6: warning: no previous prototype for >> function 'mdio_debugfs_remove' [-Wmissing-prototypes] void mdio_debugfs_remove(struct mii_bus *bus) ^ drivers/net/phy/mdio-debugfs.c:177:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void mdio_debugfs_remove(struct mii_bus *bus) ^ static >> drivers/net/phy/mdio-debugfs.c:184:12: warning: no previous prototype for >> function 'mdio_debugfs_init' [-Wmissing-prototypes] int __init mdio_debugfs_init(void) ^ drivers/net/phy/mdio-debugfs.c:184:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __init mdio_debugfs_init(void) ^ static >> drivers/net/phy/mdio-debugfs.c:192:13: warning: no previous prototype for >> function 'mdio_debugfs_exit' [-Wmissing-prototypes] void __exit mdio_debugfs_exit(void) ^ drivers/net/phy/mdio-debugfs.c:192:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __exit mdio_debugfs_exit(void) ^ static 24 warnings generated. vim +/mdio_debugfs_add +170 drivers/net/phy/mdio-debugfs.c 169 > 170 void mdio_debugfs_add(struct mii_bus *bus) 171 { 172 bus->debugfs_dentry = debugfs_create_dir(dev_name(&bus->dev), mdio_debugfs_dentry); 173 debugfs_create_file("control", 0600, bus->debugfs_dentry, bus, &mdio_debug_fops); 174 } 175 EXPORT_SYMBOL_GPL(mdio_debugfs_add); 176 > 177 void mdio_debugfs_remove(struct mii_bus *bus) 178 { 179 debugfs_remove(bus->debugfs_dentry); 180 bus->debugfs_dentry = NULL; 181 } 182 EXPORT_SYMBOL_GPL(mdio_debugfs_remove); 183 > 184 int __init mdio_debugfs_init(void) 185 { 186 mdio_debugfs_dentry = debugfs_create_dir("mdio", NULL); 187 188 return PTR_ERR_OR_ZERO(mdio_debugfs_dentry); 189 } 190 module_init(mdio_debugfs_init); 191 > 192 void __exit mdio_debugfs_exit(void) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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