tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/wip head: d3c0e0b4756e5f332791eaf9b35e54e44aae25a6 commit: cf9c2ec7ff73bb35292ef2a660a73c4cada3cb68 [2/8] cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED generic config: arm64-randconfig-r003-20200818 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 790878f291fa5dc58a1c560cb6cc76fd1bfd1c5a) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu git checkout cf9c2ec7ff73bb35292ef2a660a73c4cada3cb68 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 >>): leave_mm(dev->cpu); ^ 1 error generated. # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue locking/wip git checkout cf9c2ec7ff73bb35292ef2a660a73c4cada3cb68 vim +/leave_mm +234 drivers/cpuidle/cpuidle.c 201 202 /** 203 * cpuidle_enter_state - enter the state and update stats 204 * @dev: cpuidle device for this cpu 205 * @drv: cpuidle driver for this cpu 206 * @index: index into the states table in @drv of the state to enter 207 */ 208 int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, 209 int index) 210 { 211 int entered_state; 212 213 struct cpuidle_state *target_state = &drv->states[index]; 214 bool broadcast = !!(target_state->flags & CPUIDLE_FLAG_TIMER_STOP); 215 ktime_t time_start, time_end; 216 217 /* 218 * Tell the time framework to switch to a broadcast timer because our 219 * local timer will be shut down. If a local timer is used from another 220 * CPU as a broadcast timer, this call may fail if it is not available. 221 */ 222 if (broadcast && tick_broadcast_enter()) { 223 index = find_deepest_state(drv, dev, target_state->exit_latency_ns, 224 CPUIDLE_FLAG_TIMER_STOP, false); 225 if (index < 0) { 226 default_idle_call(); 227 return -EBUSY; 228 } 229 target_state = &drv->states[index]; 230 broadcast = false; 231 } 232 233 if (target_state->flags & CPUIDLE_FLAG_TLB_FLUSHED) 235 236 /* Take note of the planned idle state. */ 237 sched_idle_set_state(target_state); 238 239 trace_cpu_idle(index, dev->cpu); 240 time_start = ns_to_ktime(local_clock()); 241 242 rcu_idle_enter(); 243 stop_critical_timings(); 244 entered_state = target_state->enter(dev, drv, index); 245 start_critical_timings(); 246 rcu_idle_exit(); 247 248 sched_clock_idle_wakeup_event(); 249 time_end = ns_to_ktime(local_clock()); 250 trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu); 251 252 /* The cpu is no longer idle or about to enter idle. */ 253 sched_idle_set_state(NULL); 254 255 if (broadcast) { 256 if (WARN_ON_ONCE(!irqs_disabled())) 257 local_irq_disable(); 258 259 tick_broadcast_exit(); 260 } 261 262 if (!cpuidle_state_is_coupled(drv, index)) 263 local_irq_enable(); 264 265 if (entered_state >= 0) { 266 s64 diff, delay = drv->states[entered_state].exit_latency_ns; 267 int i; 268 269 /* 270 * Update cpuidle counters 271 * This can be moved to within driver enter routine, 272 * but that results in multiple copies of same code. 273 */ 274 diff = ktime_sub(time_end, time_start); 275 276 dev->last_residency_ns = diff; 277 dev->states_usage[entered_state].time_ns += diff; 278 dev->states_usage[entered_state].usage++; 279 280 if (diff < drv->states[entered_state].target_residency_ns) { 281 for (i = entered_state - 1; i >= 0; i--) { 282 if (dev->states_usage[i].disable) 283 continue; 284 285 /* Shallower states are enabled, so update. */ 286 dev->states_usage[entered_state].above++; 287 break; 288 } 289 } else if (diff > delay) { 290 for (i = entered_state + 1; i < drv->state_count; i++) { 291 if (dev->states_usage[i].disable) 292 continue; 293 294 /* 295 * Update if a deeper state would have been a 296 * better match for the observed idle duration. 297 */ 298 if (diff - delay >= drv->states[i].target_residency_ns) 299 dev->states_usage[entered_state].below++; 300 301 break; 302 } 303 } 304 } else { 305 dev->last_residency_ns = 0; 306 } 307 308 return entered_state; 309 } 310 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org