tree: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/fiq head: cdd1f26172a46397fcc4e659c7cd1a0fa78e13e7 commit: a117a04cd7136520a32af6c4fb39e40cba1dacb2 [5/9] arm64: irq: add a default handle_irq panic function config: arm64-randconfig-r035-20210219 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # 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/fiq git checkout a117a04cd7136520a32af6c4fb39e40cba1dacb2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang 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 warnings (new ones prefixed by >>): void default_handle_irq(struct pt_regs *regs) ^ arch/arm64/kernel/irq.c:74:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void default_handle_irq(struct pt_regs *regs) ^ static arch/arm64/kernel/irq.c:90:13: warning: no previous prototype for function 'init_IRQ' [-Wmissing-prototypes] void __init init_IRQ(void) ^ arch/arm64/kernel/irq.c:90:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __init init_IRQ(void) ^ static 2 warnings generated. vim +/default_handle_irq +74 arch/arm64/kernel/irq.c 73 75 { 76 panic("IRQ taken without a registered IRQ controller\n"); 77 } 78 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org