tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git genirq head: 53cc7c5b089bb7f673fc14f830c4a5d665812b1d commit: 0b1d6bdfe64f977586bbe94a054d82dd816a0aeb [35/56] ARM: smp: Use irq_desc_kstat_cpu() in show_ipi_list() config: arm-defconfig (attached as .config) compiler: arm-linux-gnueabi-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://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id... git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git git fetch --no-tags tglx-devel genirq git checkout 0b1d6bdfe64f977586bbe94a054d82dd816a0aeb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): arch/arm/kernel/smp.c: In function 'show_ipi_list': 544 | unsigned int irq; | ^~~ arch/arm/kernel/smp.c: At top level: arch/arm/kernel/smp.c:575:6: warning: no previous prototype for 'arch_irq_work_raise' [-Wmissing-prototypes] 575 | void arch_irq_work_raise(void) | ^~~~~~~~~~~~~~~~~~~ arch/arm/kernel/smp.c:779:6: warning: no previous prototype for 'panic_smp_self_stop' [-Wmissing-prototypes] 779 | void panic_smp_self_stop(void) | ^~~~~~~~~~~~~~~~~~~ arch/arm/kernel/smp.c:791:5: warning: no previous prototype for 'setup_profiling_timer' [-Wmissing-prototypes] 791 | int setup_profiling_timer(unsigned int multiplier) | ^~~~~~~~~~~~~~~~~~~~~ vim +/irq +544 arch/arm/kernel/smp.c 365ec7b1732732 Nicolas Pitre 2014-07-25 538 f13cd4170ee789 Russell King 2010-11-15 539 void show_ipi_list(struct seq_file *p, int prec) ^1da177e4c3f41 Linus Torvalds 2005-04-16 540 { 4a88abd7b48e8e Russell King 2010-11-15 541 unsigned int cpu, i; ^1da177e4c3f41 Linus Torvalds 2005-04-16 542 4a88abd7b48e8e Russell King 2010-11-15 543 for (i = 0; i < NR_IPI; i++) { 220387048d8598 Marc Zyngier 2020-09-25 @544 unsigned int irq; 220387048d8598 Marc Zyngier 2020-09-25 545 220387048d8598 Marc Zyngier 2020-09-25 546 if (!ipi_desc[i]) 220387048d8598 Marc Zyngier 2020-09-25 547 continue; 220387048d8598 Marc Zyngier 2020-09-25 548 220387048d8598 Marc Zyngier 2020-09-25 549 irq = irq_desc_get_irq(ipi_desc[i]); 4a88abd7b48e8e Russell King 2010-11-15 550 seq_printf(p, "%*s%u: ", prec - 1, "IPI", i); ^1da177e4c3f41 Linus Torvalds 2005-04-16 551 026b7c6bf0bf04 Nicolas Pitre 2012-12-03 552 for_each_online_cpu(cpu) 0b1d6bdfe64f97 Thomas Gleixner 2020-12-10 553 seq_printf(p, "%10u ", irq_desc_kstat_cpu(ipi_desc[i], cpu)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 554 4a88abd7b48e8e Russell King 2010-11-15 555 seq_printf(p, " %s\n", ipi_types[i]); 4a88abd7b48e8e Russell King 2010-11-15 556 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 557 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 558 :::::: The code at line 544 was first introduced by commit :::::: 220387048d859896ccc362c0ebf9bc1e0fa62eb9 ARM: Handle no IPI being registered in show_ipi_list() :::::: TO: Marc Zyngier <maz(a)kernel.org&gt; :::::: CC: Marc Zyngier <maz(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org