Hi Nick, kernel test robot noticed the following build errors: [auto build test ERROR on 52a93d39b17dc7eb98b6aa3edb93943248e03b2f] url: https://github.com/intel-lab-lkp/linux/commits/Nick-Desaulniers/Makefile-extrawarn-enable-Wmissing-variable-declarations-for-W-1/20230808-005859 base: 52a93d39b17dc7eb98b6aa3edb93943248e03b2f patch link: https://lore.kernel.org/r/20230807-missing_proto-v2-1-3ae2e188bb0c%40google.com patch subject: [PATCH v2] Makefile.extrawarn: enable -Wmissing-variable-declarations for W=1 config: arm64-randconfig-r013-20230807 (https://download.01.org/0day-ci/archive/20230808/202308081508.EI3CRzQo-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce: (https://download.01.org/0day-ci/archive/20230808/202308081508.EI3CRzQo-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202308081508.EI3CRzQo-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): In file included from lib/test_bitops.c:9: In file included from include/linux/module.h:13: In file included from include/linux/stat.h:19: In file included from include/linux/time.h:60: In file included from include/linux/time32.h:13: In file included from include/linux/timex.h:67: In file included from arch/arm64/include/asm/timex.h:8: In file included from arch/arm64/include/asm/arch_timer.h:18: In file included from include/linux/smp.h:110: In file included from include/linux/preempt.h:79: In file included from arch/arm64/include/asm/preempt.h:6: In file included from include/linux/thread_info.h:60: In file included from arch/arm64/include/asm/thread_info.h:18: >> arch/arm64/include/asm/stack_pointer.h:8:24: error: no previous extern declaration for non-static variable 'current_stack_pointer' [-Werror,-Wmissing-variable-declarations] 8 | register unsigned long current_stack_pointer asm ("sp"); | ^ arch/arm64/include/asm/stack_pointer.h:8:10: note: declare 'static' if the variable is not intended to be used outside of this translation unit 8 | register unsigned long current_stack_pointer asm ("sp"); | ^ 1 error generated. vim +/current_stack_pointer +8 arch/arm64/include/asm/stack_pointer.h a9ea0017ebe888 Mark Rutland 2016-11-03 4 a9ea0017ebe888 Mark Rutland 2016-11-03 5 /* a9ea0017ebe888 Mark Rutland 2016-11-03 6 * how to get the current stack pointer from C a9ea0017ebe888 Mark Rutland 2016-11-03 7 */ a9ea0017ebe888 Mark Rutland 2016-11-03 @8 register unsigned long current_stack_pointer asm ("sp"); a9ea0017ebe888 Mark Rutland 2016-11-03 9 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
