tree: git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git arm-vmap-stacks-v2 head: f1ff5483bf30001244ae041017085f63f8dcc9fc commit: f1ff5483bf30001244ae041017085f63f8dcc9fc [19/19] ARM: implement support for vmap'ed stacks config: arm-buildonly-randconfig-r002-20211013 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a8c695542b2987eb9a203d5663a0740cb4725f) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id... git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git git fetch --no-tags ardb arm-vmap-stacks-v2 git checkout f1ff5483bf30001244ae041017085f63f8dcc9fc # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 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/arm/kernel/traps.c:95:6: error: no previous prototype for function 'dump_backtrace_stm' [-Werror,-Wmissing-prototypes] void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl) ^ arch/arm/kernel/traps.c:95:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl) ^ static arch/arm/kernel/traps.c:446:17: error: no previous prototype for function 'do_undefinstr' [-Werror,-Wmissing-prototypes] asmlinkage void do_undefinstr(struct pt_regs *regs) ^ arch/arm/kernel/traps.c:446:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage void do_undefinstr(struct pt_regs *regs) ^ static arch/arm/kernel/traps.c:511:39: error: no previous prototype for function 'handle_fiq_as_nmi' [-Werror,-Wmissing-prototypes] asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs) ^ arch/arm/kernel/traps.c:511:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs) ^ static arch/arm/kernel/traps.c:530:17: error: no previous prototype for function 'bad_mode' [-Werror,-Wmissing-prototypes] asmlinkage void bad_mode(struct pt_regs *regs, int reason) ^ arch/arm/kernel/traps.c:530:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage void bad_mode(struct pt_regs *regs, int reason) ^ static arch/arm/kernel/traps.c:603:16: error: no previous prototype for function 'arm_syscall' [-Werror,-Wmissing-prototypes] asmlinkage int arm_syscall(int no, struct pt_regs *regs) ^ arch/arm/kernel/traps.c:603:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage int arm_syscall(int no, struct pt_regs *regs) ^ static arch/arm/kernel/traps.c:729:1: error: no previous prototype for function 'baddataabort' [-Werror,-Wmissing-prototypes] baddataabort(int code, unsigned long instr, struct pt_regs *regs) ^ arch/arm/kernel/traps.c:728:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage void ^ static arch/arm/kernel/traps.c:769:17: error: no previous prototype for function '__div0' [-Werror,-Wmissing-prototypes] asmlinkage void __div0(void) ^ arch/arm/kernel/traps.c:769:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage void __div0(void) ^ static asmlinkage void handle_bad_stack(struct pt_regs *regs) ^ arch/arm/kernel/traps.c:850:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage void handle_bad_stack(struct pt_regs *regs) ^ static 8 errors generated. vim +/handle_bad_stack +850 arch/arm/kernel/traps.c 849 851 { 852 unsigned long tsk_stk = (unsigned long)current->stack; 853 unsigned long irq_stk = (unsigned long)this_cpu_read(irq_stack_ptr); 854 unsigned long ovf_stk = (unsigned long)this_cpu_ptr(overflow_stack); 855 856 console_verbose(); 857 pr_emerg("Insufficient stack space to handle exception!"); 858 859 pr_emerg("Task stack: [0x%08lx..0x%08lx]\n", 860 tsk_stk, tsk_stk + THREAD_SIZE); 861 pr_emerg("IRQ stack: [0x%08lx..0x%08lx]\n", 862 irq_stk, irq_stk + THREAD_SIZE); 863 pr_emerg("Overflow stack: [0x%08lx..0x%08lx]\n", 864 ovf_stk, ovf_stk + OVERFLOW_STACK_SIZE); 865 866 die("kernel stack overflow", regs, 0); 867 } 868 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org