Hi Marc,

I love your patch! Yet something to improve:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on arm/for-next v5.9-rc3 next-20200828]
[cannot apply to tip/irq/core]
[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/Marc-Zyngier/arm-arm64-Turning-IPIs-into-normal-interrupts/20200901-225407
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm-realview_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
        # 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@intel.com>

All errors (new ones prefixed by >>):

   arch/arm/kernel/smp.c: In function 'show_ipi_list':
>> arch/arm/kernel/smp.c:537:27: error: implicit declaration of function 'kstat_irqs_cpu' [-Werror=implicit-function-declaration]
     537 |    seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
         |                           ^~~~~~~~~~~~~~
   arch/arm/kernel/smp.c: At top level:
   arch/arm/kernel/smp.c:559:6: warning: no previous prototype for 'arch_irq_work_raise' [-Wmissing-prototypes]
     559 | void arch_irq_work_raise(void)
         |      ^~~~~~~~~~~~~~~~~~~
   arch/arm/kernel/smp.c:774:6: warning: no previous prototype for 'panic_smp_self_stop' [-Wmissing-prototypes]
     774 | void panic_smp_self_stop(void)
         |      ^~~~~~~~~~~~~~~~~~~
   arch/arm/kernel/smp.c:786:5: warning: no previous prototype for 'setup_profiling_timer' [-Wmissing-prototypes]
     786 | int setup_profiling_timer(unsigned int multiplier)
         |     ^~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

# https://github.com/0day-ci/linux/commit/780a93ca7a729bf2414f45d5322cc62f43ae4070
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Marc-Zyngier/arm-arm64-Turning-IPIs-into-normal-interrupts/20200901-225407
git checkout 780a93ca7a729bf2414f45d5322cc62f43ae4070
vim +/kstat_irqs_cpu +537 arch/arm/kernel/smp.c

   527	
   528	void show_ipi_list(struct seq_file *p, int prec)
   529	{
   530		unsigned int cpu, i;
   531	
   532		for (i = 0; i < NR_IPI; i++) {
   533			unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
   534			seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
   535	
   536			for_each_online_cpu(cpu)
 > 537				seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
   538	
   539			seq_printf(p, " %s\n", ipi_types[i]);
   540		}
   541	}
   542	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org