tree: https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git mips-next head: da1bd29742b185c00a1737ba955aa3e75659be2b commit: e9dfbaaeef1c9fee3f3a898defc4562db20c2edf [48/49] MIPS: perf: Add hardware perf events support for new Loongson-3 config: mips-loongson3_defconfig (attached as .config) compiler: mips64el-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout e9dfbaaeef1c9fee3f3a898defc4562db20c2edf # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/linux/compiler_types.h:59, from <command-line>: arch/mips/kernel/perf_event_mipsxx.c: In function 'reset_counters': include/linux/compiler_attributes.h:200:41: error: attribute 'fallthrough' not preceding a case label or default label [-Werror] 200 | # define fallthrough __attribute__((__fallthrough__)) | ^~~~~~~~~~~~~ 932 | fallthrough; | ^~~~~~~~~~~ arch/mips/kernel/perf_event_mipsxx.c: In function 'loongson3_reset_counters': include/linux/compiler_attributes.h:200:41: error: attribute 'fallthrough' not preceding a case label or default label [-Werror] 200 | # define fallthrough __attribute__((__fallthrough__)) | ^~~~~~~~~~~~~ arch/mips/kernel/perf_event_mipsxx.c:903:3: note: in expansion of macro 'fallthrough' 903 | fallthrough; | ^~~~~~~~~~~ cc1: all warnings being treated as errors vim +/fallthrough +932 arch/mips/kernel/perf_event_mipsxx.c 906 907 static void reset_counters(void *arg) 908 { 909 int counters = (int)(long)arg; 910 911 if (get_loongson3_pmu_type() == LOONGSON_PMU_TYPE2) { 912 loongson3_reset_counters(arg); 913 return; 914 } 915 916 switch (counters) { 917 case 4: 918 mipsxx_pmu_write_control(3, 0); 919 mipspmu.write_counter(3, 0); 920 fallthrough; 921 case 3: 922 mipsxx_pmu_write_control(2, 0); 923 mipspmu.write_counter(2, 0); 924 fallthrough; 925 case 2: 926 mipsxx_pmu_write_control(1, 0); 927 mipspmu.write_counter(1, 0); 928 fallthrough; 929 case 1: 930 mipsxx_pmu_write_control(0, 0); 931 mipspmu.write_counter(0, 0); 933 } 934 } 935 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org