tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.9.y head: d7f83e4f45e886d919bc985bd225b8355ddd9284 commit: bd67557464c2cf89e239da1f11c5d8905ee18f01 [8774/9999] ARC: handle gcc generated __builtin_trap for older compiler config: arc-defconfig (attached as .config) compiler: arc-elf-gcc (GCC) 7.5.0 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/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.9.y git checkout bd67557464c2cf89e239da1f11c5d8905ee18f01 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=arc 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/arc/kernel/traps.c:80:48: warning: no previous declaration for 'do_privilege_fault' [-Wmissing-declarations] DO_ERROR_INFO(SIGILL, "Priv Op/Disabled Extn", do_privilege_fault, ILL_PRVOPC) ^ arch/arc/kernel/traps.c:66:5: note: in definition of macro 'DO_ERROR_INFO' int name(unsigned long address, struct pt_regs *regs) \ ^~~~ arch/arc/kernel/traps.c:81:44: warning: no previous declaration for 'do_extension_fault' [-Wmissing-declarations] DO_ERROR_INFO(SIGILL, "Invalid Extn Insn", do_extension_fault, ILL_ILLOPC) ^ arch/arc/kernel/traps.c:66:5: note: in definition of macro 'DO_ERROR_INFO' int name(unsigned long address, struct pt_regs *regs) \ ^~~~ arch/arc/kernel/traps.c:82:48: warning: no previous declaration for 'insterror_is_error' [-Wmissing-declarations] DO_ERROR_INFO(SIGILL, "Illegal Insn (or Seq)", insterror_is_error, ILL_ILLOPC) ^ arch/arc/kernel/traps.c:66:5: note: in definition of macro 'DO_ERROR_INFO' int name(unsigned long address, struct pt_regs *regs) \ ^~~~ arch/arc/kernel/traps.c:83:45: warning: no previous declaration for 'do_memory_error' [-Wmissing-declarations] DO_ERROR_INFO(SIGBUS, "Invalid Mem Access", do_memory_error, BUS_ADRERR) ^ arch/arc/kernel/traps.c:66:5: note: in definition of macro 'DO_ERROR_INFO' int name(unsigned long address, struct pt_regs *regs) \ ^~~~ arch/arc/kernel/traps.c:84:42: warning: no previous declaration for 'trap_is_brkpt' [-Wmissing-declarations] DO_ERROR_INFO(SIGTRAP, "Breakpoint Set", trap_is_brkpt, TRAP_BRKPT) ^ arch/arc/kernel/traps.c:66:5: note: in definition of macro 'DO_ERROR_INFO' int name(unsigned long address, struct pt_regs *regs) \ ^~~~ arch/arc/kernel/traps.c:85:44: warning: no previous declaration for 'do_misaligned_error' [-Wmissing-declarations] DO_ERROR_INFO(SIGBUS, "Misaligned Access", do_misaligned_error, BUS_ADRALN) ^ arch/arc/kernel/traps.c:66:5: note: in definition of macro 'DO_ERROR_INFO' int name(unsigned long address, struct pt_regs *regs) \ ^~~~ arch/arc/kernel/traps.c:90:5: warning: no previous declaration for 'do_misaligned_access' [-Wmissing-declarations] int do_misaligned_access(unsigned long address, struct pt_regs *regs, ^~~~~~~~~~~~~~~~~~~~ arch/arc/kernel/traps.c:104:6: warning: no previous declaration for 'do_machine_check_fault' [-Wmissing-declarations] void do_machine_check_fault(unsigned long address, struct pt_regs *regs) ^~~~~~~~~~~~~~~~~~~~~~ arch/arc/kernel/traps.c:119:6: warning: no previous declaration for 'do_non_swi_trap' [-Wmissing-declarations] void do_non_swi_trap(unsigned long address, struct pt_regs *regs) ^~~~~~~~~~~~~~~ arch/arc/kernel/traps.c:147:6: warning: no previous declaration for 'do_insterror_or_kprobe' [-Wmissing-declarations] void do_insterror_or_kprobe(unsigned long address, struct pt_regs *regs) ^~~~~~~~~~~~~~~~~~~~~~ void abort(void) ^~~~~ vim +/abort +162 arch/arc/kernel/traps.c 158 159 /* 160 * abort() call generated by older gcc for __builtin_trap() 161 */ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org