Hi Geert, I love your patch! Yet something to improve: [auto build test ERROR on arm64/for-next/core] [also build test ERROR on v5.10 next-20201215] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Geert-Uytterhoeven/arm64-smp-Rem... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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://github.com/0day-ci/linux/commit/846fff4a14d7c14a353d85b97cf8fbd62... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Geert-Uytterhoeven/arm64-smp-Remove-unused-irq-variable-in-arch_show_interrupts/20201215-183804 git checkout 846fff4a14d7c14a353d85b97cf8fbd625f4a887 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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/arm64/kernel/smp.c: In function 'arch_show_interrupts': 811 | seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu)); | ^~~ | rq arch/arm64/kernel/smp.c:811:42: note: each undeclared identifier is reported only once for each function it appears in arch/arm64/kernel/smp.c: At top level: arch/arm64/kernel/smp.c:837:6: warning: no previous prototype for 'arch_irq_work_raise' [-Wmissing-prototypes] 837 | void arch_irq_work_raise(void) | ^~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/smp.c:857:6: warning: no previous prototype for 'panic_smp_self_stop' [-Wmissing-prototypes] 857 | void panic_smp_self_stop(void) | ^~~~~~~~~~~~~~~~~~~ vim +811 arch/arm64/kernel/smp.c a263881525310e1 Marc Zyngier 2020-06-20 802 a263881525310e1 Marc Zyngier 2020-06-20 803 int arch_show_interrupts(struct seq_file *p, int prec) 08e875c16a16c95 Catalin Marinas 2012-03-05 804 { 08e875c16a16c95 Catalin Marinas 2012-03-05 805 unsigned int cpu, i; 08e875c16a16c95 Catalin Marinas 2012-03-05 806 08e875c16a16c95 Catalin Marinas 2012-03-05 807 for (i = 0; i < NR_IPI; i++) { 45ed695ac10a23c Nicolas Pitre 2014-07-25 808 seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i, 08e875c16a16c95 Catalin Marinas 2012-03-05 809 prec >= 4 ? " " : ""); 67317c2689567c2 Sudeep Holla 2013-11-07 810 for_each_online_cpu(cpu) a263881525310e1 Marc Zyngier 2020-06-20 @811 seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu)); 08e875c16a16c95 Catalin Marinas 2012-03-05 812 seq_printf(p, " %s\n", ipi_types[i]); 08e875c16a16c95 Catalin Marinas 2012-03-05 813 } 08e875c16a16c95 Catalin Marinas 2012-03-05 814 a263881525310e1 Marc Zyngier 2020-06-20 815 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); a263881525310e1 Marc Zyngier 2020-06-20 816 return 0; 08e875c16a16c95 Catalin Marinas 2012-03-05 817 } 08e875c16a16c95 Catalin Marinas 2012-03-05 818 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org