tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/entry-deasm-new head: ba43343df6dc8eb4be061490e0b895ec945ea4f3 commit: ba43343df6dc8eb4be061490e0b895ec945ea4f3 [12/12] arm64: entry: convert irq entry to C config: arm64-randconfig-r001-20200717 (attached as .config) compiler: aarch64-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 git checkout ba43343df6dc8eb4be061490e0b895ec945ea4f3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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 >>): arch/arm64/kernel/entry-common.c:71:25: warning: no previous prototype for 'el1_sync_handler' [-Wmissing-prototypes] 71 | asmlinkage void notrace el1_sync_handler(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~ arch/arm64/kernel/entry-common.c:226:25: warning: no previous prototype for 'el0_sync_handler' [-Wmissing-prototypes] 226 | asmlinkage void notrace el0_sync_handler(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~ 366 | asmlinkage void notrace el1_irq_handler(struct pt_regs *regs) | ^~~~~~~~~~~~~~~ 384 | asmlinkage void notrace el0_irq_handler(struct pt_regs *regs) | ^~~~~~~~~~~~~~~ vim +/el1_irq_handler +366 arch/arm64/kernel/entry-common.c 365 367 { 368 trace_hardirqs_off(); 369 invoke_irq_handler(regs); 370 el1_preempt(); 371 trace_hardirqs_on(); 372 } 373 NOKPROBE_SYMBOL(el1_irq_handler); 374 375 static inline void notrace do_el0_irq_bp_hardening(struct pt_regs *regs) 376 { 377 if (!IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) 378 return; 379 if (regs->pc & BIT(55)) 380 arm64_apply_bp_hardening(); 381 } 382 NOKPROBE_SYMBOL(do_el0_irq_bp_hardening); 383 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org