Hi Andrzej, I love your patch! Yet something to improve: [auto build test ERROR on 2ef96a5bb12be62ef75b5828c0aab838ebb29cb8] url: https://github.com/0day-ci/linux/commits/Andrzej-Pietrasiewicz/Magic-SysR... base: 2ef96a5bb12be62ef75b5828c0aab838ebb29cb8 config: alpha-defconfig (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): drivers/tty/sysrq.c: In function 'sysrq_str_to_signal': 791 | {"SIGSTKFLT", SIGSTKFLT}, | ^~~~~~~~~ | SIGSTKSZ drivers/tty/sysrq.c:791:17: note: each undeclared identifier is reported only once for each function it appears in vim +791 drivers/tty/sysrq.c 771 772 static void sysrq_str_to_signal(void) 773 { 774 static const struct signal_search signals[] = { 775 {"SIGHUP", SIGHUP}, 776 {"SIGINT", SIGINT}, 777 {"SIGQUIT", SIGQUIT}, 778 {"SIGILL", SIGILL}, 779 {"SIGTRAP", SIGTRAP}, 780 {"SIGABRT", SIGABRT}, 781 {"SIGIOT", SIGIOT}, 782 {"SIGBUS", SIGBUS}, 783 {"SIGFPE", SIGFPE}, 784 {"SIGKILL", SIGKILL}, 785 {"SIGUSR1", SIGUSR1}, 786 {"SIGSEGV", SIGSEGV}, 787 {"SIGUSR2", SIGUSR2}, 788 {"SIGPIPE", SIGPIPE}, 789 {"SIGALRM", SIGALRM}, 790 {"SIGTERM", SIGTERM}, 792 {"SIGCHLD", SIGCHLD}, 793 {"SIGCONT", SIGCONT}, 794 {"SIGSTOP", SIGSTOP}, 795 {"SIGTSTP", SIGTSTP}, 796 {"SIGTTIN", SIGTTIN}, 797 {"SIGTTOU", SIGTTOU}, 798 {"SIGURG", SIGURG}, 799 {"SIGXCPU", SIGXCPU}, 800 {"SIGXFSZ", SIGXFSZ}, 801 {"SIGVTALRM", SIGVTALRM}, 802 {"SIGPROF", SIGPROF}, 803 {"SIGWINCH", SIGWINCH}, 804 {"SIGIO", SIGIO}, 805 {"SIGPOLL", SIGPOLL}, 806 {"SIGPWR", SIGPWR}, 807 {"SIGSYS", SIGSYS}, 808 }; 809 int i; 810 811 if (!sysrq_signal) 812 return; 813 814 for (i = 0; i < ARRAY_SIZE(signals); ++i) 815 if (!strcmp(signals[i].name, sysrq_signal)) 816 break; 817 818 if (i >= ARRAY_SIZE(signals)) { 819 pr_err("Unknown signal name %s", sysrq_signal); 820 821 return; 822 } 823 824 sysrq_signal_code = signals[i].code; 825 } 826 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org