Hi Robert, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: dfa377c35d70c31139b1274ec49f87d380996c42 commit: debf69cfd4c618c7036a13cc4edd1faf87ce7d53 irqchip/xilinx: Expose Kconfig option for Zynq/ZynqMP date: 4 months ago config: arm64-randconfig-r026-20210814 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1f7b25ea76a925aca690da28de9d78db7ca99d0c) 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/torvalds/linux.git/commit/?id=debf69cfd4c618c7036a13cc4edd1faf87ce7d53 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout debf69cfd4c618c7036a13cc4edd1faf87ce7d53 # 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 All warnings (new ones prefixed by >>): >> drivers/irqchip/irq-xilinx-intc.c:127:14: warning: no previous prototype for function 'xintc_get_irq' [-Wmissing-prototypes] unsigned int xintc_get_irq(void) ^ drivers/irqchip/irq-xilinx-intc.c:127:1: note: declare 'static' if the function is not intended to be used outside of this translation unit unsigned int xintc_get_irq(void) ^ static 1 warning generated. vim +/xintc_get_irq +127 drivers/irqchip/irq-xilinx-intc.c 67862a3c47fcfc Mubin Sayyed 2020-03-17 126 4cea749d56bec9 Marc Zyngier 2020-03-30 @127 unsigned int xintc_get_irq(void) 4cea749d56bec9 Marc Zyngier 2020-03-30 128 { 4cea749d56bec9 Marc Zyngier 2020-03-30 129 unsigned int irq = -1; 4cea749d56bec9 Marc Zyngier 2020-03-30 130 u32 hwirq; 4cea749d56bec9 Marc Zyngier 2020-03-30 131 4cea749d56bec9 Marc Zyngier 2020-03-30 132 hwirq = xintc_read(primary_intc, IVR); 4cea749d56bec9 Marc Zyngier 2020-03-30 133 if (hwirq != -1U) 4cea749d56bec9 Marc Zyngier 2020-03-30 134 irq = irq_find_mapping(primary_intc->root_domain, hwirq); 4cea749d56bec9 Marc Zyngier 2020-03-30 135 4cea749d56bec9 Marc Zyngier 2020-03-30 136 pr_debug("irq-xilinx: hwirq=%d, irq=%d\n", hwirq, irq); 4cea749d56bec9 Marc Zyngier 2020-03-30 137 4cea749d56bec9 Marc Zyngier 2020-03-30 138 return irq; 4cea749d56bec9 Marc Zyngier 2020-03-30 139 } 4cea749d56bec9 Marc Zyngier 2020-03-30 140 :::::: The code at line 127 was first introduced by commit :::::: 4cea749d56bec9409f3bd126d2b2f949dc6c66e2 Revert "irqchip/xilinx: Enable generic irq multi handler" :::::: TO: Marc Zyngier :::::: CC: Marc Zyngier --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org