tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: aacdecce8147c20b01f865b4e214bb8dbe8c4af1 commit: a5bfe17b6ef2aa73b93002aacd368e67fd5e802b [2931/3119] proc: Make the proc_create[_data]() stubs static inlines config: sparc-buildonly-randconfig-r002-20211123 (https://download.01.org/0day-ci/archive/20211123/202111232211.EGcf1OEb-lk...) compiler: sparc-linux-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/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 a5bfe17b6ef2aa73b93002aacd368e67fd5e802b # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sparc SHELL=/bin/bash arch/sparc/kernel/ 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 >>): arch/sparc/kernel/led.c: In function 'led_init': 125 | led = proc_create("led", 0, NULL, &led_proc_ops); | ^~~~~~~~~~~~ | proc_ops arch/sparc/kernel/led.c:125:44: note: each undeclared identifier is reported only once for each function it appears in vim +125 arch/sparc/kernel/led.c ee1858d3122ded Lars Kotthoff 2005-11-07 120 ee1858d3122ded Lars Kotthoff 2005-11-07 121 static int __init led_init(void) ee1858d3122ded Lars Kotthoff 2005-11-07 122 { db275f2a02cd35 Kees Cook 2017-10-09 123 timer_setup(&led_blink_timer, led_blink, 0); ee1858d3122ded Lars Kotthoff 2005-11-07 124 97a32539b9568b Alexey Dobriyan 2020-02-03 @125 led = proc_create("led", 0, NULL, &led_proc_ops); ee1858d3122ded Lars Kotthoff 2005-11-07 126 if (!led) ee1858d3122ded Lars Kotthoff 2005-11-07 127 return -ENOMEM; ee1858d3122ded Lars Kotthoff 2005-11-07 128 ee1858d3122ded Lars Kotthoff 2005-11-07 129 printk(KERN_INFO ee1858d3122ded Lars Kotthoff 2005-11-07 130 "led: version %s, Lars Kotthoff <metalhead(a)metalhead.ws&gt;\n&quot;, ee1858d3122ded Lars Kotthoff 2005-11-07 131 LED_VERSION); ee1858d3122ded Lars Kotthoff 2005-11-07 132 ee1858d3122ded Lars Kotthoff 2005-11-07 133 return 0; ee1858d3122ded Lars Kotthoff 2005-11-07 134 } ee1858d3122ded Lars Kotthoff 2005-11-07 135 :::::: The code at line 125 was first introduced by commit :::::: 97a32539b9568bb653683349e5a76d02ff3c3e2c proc: convert everything to "struct proc_ops" :::::: TO: Alexey Dobriyan <adobriyan(a)gmail.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org