Hi Paul, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fe91c4725aeed35023ba4f7a1e1adfebb6878c23 commit: c434b9f80b0923e6460031b0fd964f8b0bf3c6a6 MIPS: Kconfig: add MIPS_GENERIC_KERNEL symbol date: 1 year, 2 months ago config: mips-randconfig-r036-20211020 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 9660563950aaed54020bfdf0be07e7096a9553e4) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c434b9f80b0923e6460031b0fd964f8b0bf3c6a6 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout c434b9f80b0923e6460031b0fd964f8b0bf3c6a6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): arch/mips/kernel/asm-offsets.c:26:6: warning: no previous prototype for function 'output_ptreg_defines' [-Wmissing-prototypes] void output_ptreg_defines(void) ^ arch/mips/kernel/asm-offsets.c:26:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_ptreg_defines(void) ^ static arch/mips/kernel/asm-offsets.c:78:6: warning: no previous prototype for function 'output_task_defines' [-Wmissing-prototypes] void output_task_defines(void) ^ arch/mips/kernel/asm-offsets.c:78:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_task_defines(void) ^ static arch/mips/kernel/asm-offsets.c:93:6: warning: no previous prototype for function 'output_thread_info_defines' [-Wmissing-prototypes] void output_thread_info_defines(void) ^ arch/mips/kernel/asm-offsets.c:93:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_thread_info_defines(void) ^ static arch/mips/kernel/asm-offsets.c:110:6: warning: no previous prototype for function 'output_thread_defines' [-Wmissing-prototypes] void output_thread_defines(void) ^ arch/mips/kernel/asm-offsets.c:110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_thread_defines(void) ^ static arch/mips/kernel/asm-offsets.c:138:6: warning: no previous prototype for function 'output_thread_fpu_defines' [-Wmissing-prototypes] void output_thread_fpu_defines(void) ^ arch/mips/kernel/asm-offsets.c:138:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_thread_fpu_defines(void) ^ static arch/mips/kernel/asm-offsets.c:181:6: warning: no previous prototype for function 'output_mm_defines' [-Wmissing-prototypes] void output_mm_defines(void) ^ arch/mips/kernel/asm-offsets.c:181:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_mm_defines(void) ^ static arch/mips/kernel/asm-offsets.c:220:6: warning: no previous prototype for function 'output_sc_defines' [-Wmissing-prototypes] void output_sc_defines(void) ^ arch/mips/kernel/asm-offsets.c:220:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_sc_defines(void) ^ static arch/mips/kernel/asm-offsets.c:255:6: warning: no previous prototype for function 'output_signal_defined' [-Wmissing-prototypes] void output_signal_defined(void) ^ arch/mips/kernel/asm-offsets.c:255:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_signal_defined(void) ^ static arch/mips/kernel/asm-offsets.c:334:6: warning: no previous prototype for function 'output_pm_defines' [-Wmissing-prototypes] void output_pm_defines(void) ^ arch/mips/kernel/asm-offsets.c:334:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_pm_defines(void) ^ static arch/mips/kernel/asm-offsets.c:348:6: warning: no previous prototype for function 'output_kvm_defines' [-Wmissing-prototypes] void output_kvm_defines(void) ^ arch/mips/kernel/asm-offsets.c:348:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_kvm_defines(void) ^ static >> arch/mips/kernel/asm-offsets.c:392:6: warning: no previous prototype for function 'output_cps_defines' [-Wmissing-prototypes] void output_cps_defines(void) ^ arch/mips/kernel/asm-offsets.c:392:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_cps_defines(void) ^ static 11 warnings generated. -- >> arch/mips/kernel/mips-mt.c:50:6: warning: no previous prototype for function 'mips_mt_regdump' [-Wmissing-prototypes] void mips_mt_regdump(unsigned long mvpctl) ^ arch/mips/kernel/mips-mt.c:50:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void mips_mt_regdump(unsigned long mvpctl) ^ static >> arch/mips/kernel/mips-mt.c:159:6: warning: no previous prototype for function 'mips_mt_set_cpuoptions' [-Wmissing-prototypes] void mips_mt_set_cpuoptions(void) ^ arch/mips/kernel/mips-mt.c:159:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void mips_mt_set_cpuoptions(void) ^ static 2 warnings generated. -- arch/mips/kernel/asm-offsets.c:26:6: warning: no previous prototype for function 'output_ptreg_defines' [-Wmissing-prototypes] void output_ptreg_defines(void) ^ arch/mips/kernel/asm-offsets.c:26:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_ptreg_defines(void) ^ static arch/mips/kernel/asm-offsets.c:78:6: warning: no previous prototype for function 'output_task_defines' [-Wmissing-prototypes] void output_task_defines(void) ^ arch/mips/kernel/asm-offsets.c:78:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_task_defines(void) ^ static arch/mips/kernel/asm-offsets.c:93:6: warning: no previous prototype for function 'output_thread_info_defines' [-Wmissing-prototypes] void output_thread_info_defines(void) ^ arch/mips/kernel/asm-offsets.c:93:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_thread_info_defines(void) ^ static arch/mips/kernel/asm-offsets.c:110:6: warning: no previous prototype for function 'output_thread_defines' [-Wmissing-prototypes] void output_thread_defines(void) ^ arch/mips/kernel/asm-offsets.c:110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_thread_defines(void) ^ static arch/mips/kernel/asm-offsets.c:138:6: warning: no previous prototype for function 'output_thread_fpu_defines' [-Wmissing-prototypes] void output_thread_fpu_defines(void) ^ arch/mips/kernel/asm-offsets.c:138:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_thread_fpu_defines(void) ^ static arch/mips/kernel/asm-offsets.c:181:6: warning: no previous prototype for function 'output_mm_defines' [-Wmissing-prototypes] void output_mm_defines(void) ^ arch/mips/kernel/asm-offsets.c:181:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_mm_defines(void) ^ static arch/mips/kernel/asm-offsets.c:220:6: warning: no previous prototype for function 'output_sc_defines' [-Wmissing-prototypes] void output_sc_defines(void) ^ arch/mips/kernel/asm-offsets.c:220:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_sc_defines(void) ^ static arch/mips/kernel/asm-offsets.c:255:6: warning: no previous prototype for function 'output_signal_defined' [-Wmissing-prototypes] void output_signal_defined(void) ^ arch/mips/kernel/asm-offsets.c:255:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_signal_defined(void) ^ static arch/mips/kernel/asm-offsets.c:334:6: warning: no previous prototype for function 'output_pm_defines' [-Wmissing-prototypes] void output_pm_defines(void) ^ arch/mips/kernel/asm-offsets.c:334:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_pm_defines(void) ^ static arch/mips/kernel/asm-offsets.c:348:6: warning: no previous prototype for function 'output_kvm_defines' [-Wmissing-prototypes] void output_kvm_defines(void) ^ arch/mips/kernel/asm-offsets.c:348:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_kvm_defines(void) ^ static >> arch/mips/kernel/asm-offsets.c:392:6: warning: no previous prototype for function 'output_cps_defines' [-Wmissing-prototypes] void output_cps_defines(void) ^ arch/mips/kernel/asm-offsets.c:392:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void output_cps_defines(void) ^ static 11 warnings generated. vim +/output_cps_defines +392 arch/mips/kernel/asm-offsets.c 0ee958e102b62b Paul Burton 2014-01-15 390 0ee958e102b62b Paul Burton 2014-01-15 391 #ifdef CONFIG_MIPS_CPS 0ee958e102b62b Paul Burton 2014-01-15 @392 void output_cps_defines(void) :::::: The code at line 392 was first introduced by commit :::::: 0ee958e102b62b418c2fb46c3439d4262067a5fc MIPS: Coherent Processing System SMP implementation :::::: TO: Paul Burton :::::: CC: Ralf Baechle --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org