tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2021.08.12a head: 3d4b7b3ca5de1d3669890684c3e60d3dad6ea468 commit: 97c274758ba2517477cb43ad2c49af82ea18572d [63/72] EXP cpu: Make cpu_hp_check_delay() return true when detecting an anomaly config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 11.2.0 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/paulmck/linux-rcu.git/com... git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git git fetch --no-tags rcu dev.2021.08.12a git checkout 97c274758ba2517477cb43ad2c49af82ea18572d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 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 errors (new ones prefixed by >>): kernel/cpu.c:137:6: error: redefinition of 'cpu_hp_start_now' 137 | void cpu_hp_start_now(void) | ^~~~~~~~~~~~~~~~ In file included from kernel/cpu.c:17: include/linux/cpu.h:147:20: note: previous definition of 'cpu_hp_start_now' with type 'void(void)' 147 | static inline void cpu_hp_start_now(void) { } | ^~~~~~~~~~~~~~~~ kernel/cpu.c:146:6: error: redefinition of 'cpu_hp_stop_now' 146 | void cpu_hp_stop_now(void) | ^~~~~~~~~~~~~~~ In file included from kernel/cpu.c:17: include/linux/cpu.h:148:20: note: previous definition of 'cpu_hp_stop_now' with type 'void(void)' 148 | static inline void cpu_hp_stop_now(void) { } | ^~~~~~~~~~~~~~~ 158 | bool cpu_hp_check_delay(const char *s, const void *func) | ^~~~~~~~~~~~~~~~~~ In file included from kernel/cpu.c:17: include/linux/cpu.h:149:20: note: previous definition of 'cpu_hp_check_delay' with type 'bool(const char *, void *)' {aka '_Bool(const char *, void *)'} 149 | static inline bool cpu_hp_check_delay(const char *s, void *func) { return false; } | ^~~~~~~~~~~~~~~~~~ In file included from include/linux/printk.h:11, from include/linux/kernel.h:19, from include/linux/sched/mm.h:5, from kernel/cpu.c:6: kernel/cpu.c: In function 'cpu_hp_check_delay': kernel/cpu.c:170:48: warning: integer overflow in expression of type 'long int' results in '1215752192' [-Woverflow] 170 | if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) { | ^ include/linux/once_lite.h:15:41: note: in definition of macro 'DO_ONCE_LITE_IF' 15 | bool __ret_do_once = !!(condition); \ | ^~~~~~~~~ kernel/cpu.c:170:13: note: in expansion of macro 'WARN_ONCE' 170 | if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) { | ^~~~~~~~~ kernel/cpu.c:170:23: note: in expansion of macro 'time_after64' 170 | if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) { | ^~~~~~~~~~~~ In file included from include/linux/perf_event.h:25, from include/linux/trace_events.h:10, from include/trace/events/power.h:12, from kernel/cpu.c:37: At top level: arch/arc/include/asm/perf_event.h:126:23: warning: 'arc_pmu_cache_map' defined but not used [-Wunused-const-variable=] 126 | static const unsigned arc_pmu_cache_map[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { | ^~~~~~~~~~~~~~~~~ arch/arc/include/asm/perf_event.h:91:27: warning: 'arc_pmu_ev_hw_map' defined but not used [-Wunused-const-variable=] 91 | static const char * const arc_pmu_ev_hw_map[] = { | ^~~~~~~~~~~~~~~~~ vim +158 kernel/cpu.c 156 157 /* Return true if a time-delay anomaly was detected. */ 159 { 160 bool ret = false; 161 u64 t, t1; 162 163 if (!smp_load_acquire(&cpu_hp_start_time_valid)) 164 return false; 165 t = READ_ONCE(cpu_hp_start_time); 166 smp_mb(); 167 if (!READ_ONCE(cpu_hp_start_time_valid)) 168 return false; 169 t1 = ktime_get(); 170 if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) { 171 WRITE_ONCE(cpu_hp_start_time, t1); 172 ret = true; 173 } 174 if (WARN_ONCE(time_before64(t1, t - 25 * NSEC_PER_MSEC), "%s %ps clock went backwards %llu milliseconds\n", s, func, (t - t1) / NSEC_PER_MSEC)){ 175 WRITE_ONCE(cpu_hp_start_time, t1); 176 ret = true; 177 } 178 return ret; 179 } 180 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org