tree: https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git net-queue-work2 head: 6e6c882b9f9314372cef270671a39ea67460ea6b commit: 6e6c882b9f9314372cef270671a39ea67460ea6b [79/79] net: mdiobus: add support to access PHY registers via debugfs [*not for mainline*] config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 11.2.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git/commit/?i... git remote add kabel https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git git fetch --no-tags kabel net-queue-work2 git checkout 6e6c882b9f9314372cef270671a39ea67460ea6b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 43 | int mdiobus_register_debugfs(struct mii_bus *bus) | ^~~~~~~~~~~~~~~~~~~~~~~~ 65 | void mdiobus_unregister_debugfs(struct mii_bus *bus) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ 76 | int mdiobus_debugfs_init(void) | ^~~~~~~~~~~~~~~~~~~~ 89 | void mdiobus_debugfs_exit(void) | ^~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/mdiobus_register_debugfs +43 drivers/net/phy/mdio_debugfs.c 42 44 { 45 struct dentry *dir, *entry; 46 47 dir = debugfs_create_dir(dev_name(&bus->dev), mdiobus_dentry); 48 if (IS_ERR(dir)) 49 return PTR_ERR(dir); 50 51 debugfs_create_u32("addr", 0600, dir, &bus->debug_addr); 52 debugfs_create_u32("reg", 0600, dir, &bus->debug_reg); 53 54 entry = debugfs_create_file_unsafe("val", 0600, dir, bus, &val_fops); 55 if (IS_ERR(entry)) 56 goto fail; 57 58 return 0; 59 60 fail: 61 debugfs_remove_recursive(dir); 62 return PTR_ERR(entry); 63 } 64 66 { 67 struct dentry *dir; 68 69 dir = debugfs_lookup(dev_name(&bus->dev), mdiobus_dentry); 70 if (!dir) 71 return; 72 73 debugfs_remove_recursive(dir); 74 } 75 77 { 78 struct dentry *dentry; 79 80 dentry = debugfs_create_dir("mdio_bus", NULL); 81 if (IS_ERR(dentry)) 82 return PTR_ERR(dentry); 83 84 mdiobus_dentry = dentry; 85 86 return 0; 87 } 88 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org