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Message-ID: <202205141340.I5dWtpQ1-lkp@intel.com>
Date: Sat, 14 May 2022 13:56:39 +0800
From: kernel test robot <lkp@...el.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Guenter Roeck <groeck@...omium.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: [jsarha:topic/cros-sof-v4.14-rebase 1524/9999]
drivers/cpuidle/governors/menu.c:418 menu_select() warn: inconsistent
indenting
tree: https://github.com/jsarha/linux topic/cros-sof-v4.14-rebase
head: 18a233f3f676a98dde00947535d99ab1a54da340
commit: 308c4300425e678cc31b75bdc9e38e7f886bcb2b [1524/9999] UPSTREAM: cpuidle: menu: Refine idle state selection for running tick
config: i386-randconfig-m021 (https://download.01.org/0day-ci/archive/20220514/202205141340.I5dWtpQ1-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
smatch warnings:
drivers/cpuidle/governors/menu.c:418 menu_select() warn: inconsistent indenting
vim +418 drivers/cpuidle/governors/menu.c
278
279 /**
280 * menu_select - selects the next idle state to enter
281 * @drv: cpuidle driver containing state data
282 * @dev: the CPU
283 * @stop_tick: indication on whether or not to stop the tick
284 */
285 static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
286 bool *stop_tick)
287 {
288 struct menu_device *data = this_cpu_ptr(&menu_devices);
289 struct device *device = get_cpu_device(dev->cpu);
290 int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
291 int i;
292 int first_idx;
293 int idx;
294 unsigned int interactivity_req;
295 unsigned int expected_interval;
296 unsigned long nr_iowaiters, cpu_load;
297 int resume_latency = dev_pm_qos_raw_read_value(device);
298 ktime_t delta_next;
299
300 if (data->needs_update) {
301 menu_update(drv, dev);
302 data->needs_update = 0;
303 }
304
305 /* resume_latency is 0 means no restriction */
306 if (resume_latency && resume_latency < latency_req)
307 latency_req = resume_latency;
308
309 /* Special case when user has set very strict latency requirement */
310 if (unlikely(latency_req == 0)) {
311 *stop_tick = false;
312 return 0;
313 }
314
315 /* determine the expected residency time, round up */
316 data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length(&delta_next));
317
318 get_iowait_load(&nr_iowaiters, &cpu_load);
319 data->bucket = which_bucket(data->next_timer_us, nr_iowaiters);
320
321 /*
322 * Force the result of multiplication to be 64 bits even if both
323 * operands are 32 bits.
324 * Make sure to round up for half microseconds.
325 */
326 data->predicted_us = DIV_ROUND_CLOSEST_ULL((uint64_t)data->next_timer_us *
327 data->correction_factor[data->bucket],
328 RESOLUTION * DECAY);
329
330 expected_interval = get_typical_interval(data);
331 expected_interval = min(expected_interval, data->next_timer_us);
332
333 first_idx = 0;
334 if (drv->states[0].flags & CPUIDLE_FLAG_POLLING) {
335 struct cpuidle_state *s = &drv->states[1];
336 unsigned int polling_threshold;
337
338 /*
339 * We want to default to C1 (hlt), not to busy polling
340 * unless the timer is happening really really soon, or
341 * C1's exit latency exceeds the user configured limit.
342 */
343 polling_threshold = max_t(unsigned int, 20, s->target_residency);
344 if (data->next_timer_us > polling_threshold &&
345 latency_req > s->exit_latency && !s->disabled &&
346 !dev->states_usage[1].disable)
347 first_idx = 1;
348 }
349
350 /*
351 * Use the lowest expected idle interval to pick the idle state.
352 */
353 data->predicted_us = min(data->predicted_us, expected_interval);
354
355 /*
356 * Use the performance multiplier and the user-configurable
357 * latency_req to determine the maximum exit latency.
358 */
359 interactivity_req = data->predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
360 if (latency_req > interactivity_req)
361 latency_req = interactivity_req;
362
363 expected_interval = data->predicted_us;
364 /*
365 * Find the idle state with the lowest power while satisfying
366 * our constraints.
367 */
368 idx = -1;
369 for (i = first_idx; i < drv->state_count; i++) {
370 struct cpuidle_state *s = &drv->states[i];
371 struct cpuidle_state_usage *su = &dev->states_usage[i];
372
373 if (s->disabled || su->disable)
374 continue;
375 if (idx == -1)
376 idx = i; /* first enabled state */
377 if (s->target_residency > data->predicted_us)
378 break;
379 if (s->exit_latency > latency_req) {
380 /*
381 * If we break out of the loop for latency reasons, use
382 * the target residency of the selected state as the
383 * expected idle duration so that the tick is retained
384 * as long as that target residency is low enough.
385 */
386 expected_interval = drv->states[idx].target_residency;
387 break;
388 }
389 idx = i;
390 }
391
392 if (idx == -1)
393 idx = 0; /* No states enabled. Must use 0. */
394
395 /*
396 * Don't stop the tick if the selected state is a polling one or if the
397 * expected idle duration is shorter than the tick period length.
398 */
399 if ((drv->states[idx].flags & CPUIDLE_FLAG_POLLING) ||
400 expected_interval < TICK_USEC) {
401 unsigned int delta_next_us = ktime_to_us(delta_next);
402
403 *stop_tick = false;
404
405 if (!tick_nohz_tick_stopped() && idx > 0 &&
406 drv->states[idx].target_residency > delta_next_us) {
407 /*
408 * The tick is not going to be stopped and the target
409 * residency of the state to be returned is not within
410 * the time until the next timer event including the
411 * tick, so try to correct that.
412 */
413 for (i = idx - 1; i >= 0; i--) {
414 if (drv->states[i].disabled ||
415 dev->states_usage[i].disable)
416 continue;
417
> 418 idx = i;
419 if (drv->states[i].target_residency <= delta_next_us)
420 break;
421 }
422 }
423 }
424
425 data->last_state_idx = idx;
426
427 return data->last_state_idx;
428 }
429
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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