tree: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/domain_cleanup head: 02b62579a91b5a74d7f6f249a647511795e814ea commit: 64eba608920dc4af847abd3d8f5a4bc44528ecb1 [37/39] xtensa: Bulk conversion to generic_handle_domain_irq() config: xtensa-randconfig-r036-20210517 (attached as .config) compiler: xtensa-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://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/com... git remote add arm-platforms https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git git fetch --no-tags arm-platforms irq/domain_cleanup git checkout 64eba608920dc4af847abd3d8f5a4bc44528ecb1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=xtensa 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/xtensa/kernel/irq.c:34:17: warning: no previous prototype for 'do_IRQ' [-Wmissing-prototypes] 34 | asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) | ^~~~~~ arch/xtensa/kernel/irq.c: In function 'do_IRQ': 49 | generic_handle_domain_irq(NULL, irq); | ^~~ | rq arch/xtensa/kernel/irq.c:49:34: note: each undeclared identifier is reported only once for each function it appears in arch/xtensa/kernel/irq.c: At top level: arch/xtensa/kernel/irq.c:144:13: warning: no previous prototype for 'init_IRQ' [-Wmissing-prototypes] 144 | void __init init_IRQ(void) | ^~~~~~~~ vim +49 arch/xtensa/kernel/irq.c 33 34 asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) 35 { 36 #ifdef CONFIG_DEBUG_STACKOVERFLOW 37 /* Debugging check for stack overflow: is there less than 1KB free? */ 38 { 39 unsigned long sp; 40 41 __asm__ __volatile__ ("mov %0, a1\n" : "=a" (sp)); 42 sp &= THREAD_SIZE - 1; 43 44 if (unlikely(sp < (sizeof(thread_info) + 1024))) 45 printk("Stack overflow in do_IRQ: %ld\n", 46 sp - sizeof(struct thread_info)); 47 } 48 #endif 50 } 51 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org