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Commit | Line | Data |
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4f86d3a8 LB |
1 | /* |
2 | * cpuidle.c - core cpuidle infrastructure | |
3 | * | |
4 | * (C) 2006-2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | |
5 | * Shaohua Li <shaohua.li@intel.com> | |
6 | * Adam Belay <abelay@novell.com> | |
7 | * | |
8 | * This code is licenced under the GPL. | |
9 | */ | |
10 | ||
b60e6a0e | 11 | #include <linux/clockchips.h> |
4f86d3a8 LB |
12 | #include <linux/kernel.h> |
13 | #include <linux/mutex.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/notifier.h> | |
e8db0be1 | 16 | #include <linux/pm_qos.h> |
4f86d3a8 LB |
17 | #include <linux/cpu.h> |
18 | #include <linux/cpuidle.h> | |
9a0b8415 | 19 | #include <linux/ktime.h> |
2e94d1f7 | 20 | #include <linux/hrtimer.h> |
884b17e1 | 21 | #include <linux/module.h> |
288f023e | 22 | #include <trace/events/power.h> |
4f86d3a8 LB |
23 | |
24 | #include "cpuidle.h" | |
25 | ||
26 | DEFINE_PER_CPU(struct cpuidle_device *, cpuidle_devices); | |
4c637b21 | 27 | DEFINE_PER_CPU(struct cpuidle_device, cpuidle_dev); |
4f86d3a8 LB |
28 | |
29 | DEFINE_MUTEX(cpuidle_lock); | |
30 | LIST_HEAD(cpuidle_detected_devices); | |
4f86d3a8 LB |
31 | |
32 | static int enabled_devices; | |
62027aea | 33 | static int off __read_mostly; |
a0bfa137 | 34 | static int initialized __read_mostly; |
62027aea LB |
35 | |
36 | int cpuidle_disabled(void) | |
37 | { | |
38 | return off; | |
39 | } | |
d91ee586 LB |
40 | void disable_cpuidle(void) |
41 | { | |
42 | off = 1; | |
43 | } | |
4f86d3a8 | 44 | |
1a022e3f BO |
45 | /** |
46 | * cpuidle_play_dead - cpu off-lining | |
47 | * | |
ee01e663 | 48 | * Returns in case of an error or no driver |
1a022e3f BO |
49 | */ |
50 | int cpuidle_play_dead(void) | |
51 | { | |
52 | struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); | |
bf4d1b5d | 53 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); |
8aef33a7 | 54 | int i; |
1a022e3f | 55 | |
ee01e663 TK |
56 | if (!drv) |
57 | return -ENODEV; | |
58 | ||
1a022e3f | 59 | /* Find lowest-power state that supports long-term idle */ |
8aef33a7 DL |
60 | for (i = drv->state_count - 1; i >= CPUIDLE_DRIVER_STATE_START; i--) |
61 | if (drv->states[i].enter_dead) | |
62 | return drv->states[i].enter_dead(dev, i); | |
1a022e3f BO |
63 | |
64 | return -ENODEV; | |
65 | } | |
66 | ||
56cfbf74 CC |
67 | /** |
68 | * cpuidle_enter_state - enter the state and update stats | |
69 | * @dev: cpuidle device for this cpu | |
70 | * @drv: cpuidle driver for this cpu | |
71 | * @next_state: index into drv->states of the state to enter | |
72 | */ | |
73 | int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, | |
554c06ba | 74 | int index) |
56cfbf74 CC |
75 | { |
76 | int entered_state; | |
77 | ||
554c06ba DL |
78 | struct cpuidle_state *target_state = &drv->states[index]; |
79 | ktime_t time_start, time_end; | |
80 | s64 diff; | |
81 | ||
82 | time_start = ktime_get(); | |
83 | ||
84 | entered_state = target_state->enter(dev, drv, index); | |
85 | ||
86 | time_end = ktime_get(); | |
87 | ||
88 | local_irq_enable(); | |
89 | ||
90 | diff = ktime_to_us(ktime_sub(time_end, time_start)); | |
91 | if (diff > INT_MAX) | |
92 | diff = INT_MAX; | |
93 | ||
94 | dev->last_residency = (int) diff; | |
56cfbf74 CC |
95 | |
96 | if (entered_state >= 0) { | |
97 | /* Update cpuidle counters */ | |
98 | /* This can be moved to within driver enter routine | |
99 | * but that results in multiple copies of same code. | |
100 | */ | |
a474a515 | 101 | dev->states_usage[entered_state].time += dev->last_residency; |
56cfbf74 CC |
102 | dev->states_usage[entered_state].usage++; |
103 | } else { | |
104 | dev->last_residency = 0; | |
105 | } | |
106 | ||
107 | return entered_state; | |
108 | } | |
109 | ||
4f86d3a8 LB |
110 | /** |
111 | * cpuidle_idle_call - the main idle loop | |
112 | * | |
113 | * NOTE: no locks or semaphores should be used here | |
a0bfa137 | 114 | * return non-zero on failure |
4f86d3a8 | 115 | */ |
a0bfa137 | 116 | int cpuidle_idle_call(void) |
4f86d3a8 | 117 | { |
4a6f4fe8 | 118 | struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); |
bf4d1b5d | 119 | struct cpuidle_driver *drv; |
e978aa7d | 120 | int next_state, entered_state; |
fb11c9c6 | 121 | bool broadcast; |
4f86d3a8 | 122 | |
9b29a86f | 123 | if (off || !initialized) |
a0bfa137 LB |
124 | return -ENODEV; |
125 | ||
4f86d3a8 | 126 | /* check if the device is ready */ |
a0bfa137 LB |
127 | if (!dev || !dev->enabled) |
128 | return -EBUSY; | |
4f86d3a8 | 129 | |
bf4d1b5d DL |
130 | drv = cpuidle_get_cpu_driver(dev); |
131 | ||
4f86d3a8 | 132 | /* ask the governor for the next state */ |
46bcfad7 | 133 | next_state = cpuidle_curr_governor->select(drv, dev); |
246eb7f0 | 134 | if (need_resched()) { |
d73d68dc YS |
135 | dev->last_residency = 0; |
136 | /* give the governor an opportunity to reflect on the outcome */ | |
137 | if (cpuidle_curr_governor->reflect) | |
138 | cpuidle_curr_governor->reflect(dev, next_state); | |
246eb7f0 | 139 | local_irq_enable(); |
a0bfa137 | 140 | return 0; |
246eb7f0 KH |
141 | } |
142 | ||
fb11c9c6 VK |
143 | broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP); |
144 | ||
ba8f20c2 PM |
145 | if (broadcast && |
146 | clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu)) | |
147 | return -EBUSY; | |
148 | ||
149 | ||
150 | trace_cpu_idle_rcuidle(next_state, dev->cpu); | |
b60e6a0e | 151 | |
4126c019 CC |
152 | if (cpuidle_state_is_coupled(dev, drv, next_state)) |
153 | entered_state = cpuidle_enter_state_coupled(dev, drv, | |
154 | next_state); | |
155 | else | |
156 | entered_state = cpuidle_enter_state(dev, drv, next_state); | |
f77cfe4e | 157 | |
ba8f20c2 PM |
158 | trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu); |
159 | ||
fb11c9c6 | 160 | if (broadcast) |
6d281e97 | 161 | clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu); |
b60e6a0e | 162 | |
4f86d3a8 LB |
163 | /* give the governor an opportunity to reflect on the outcome */ |
164 | if (cpuidle_curr_governor->reflect) | |
e978aa7d | 165 | cpuidle_curr_governor->reflect(dev, entered_state); |
a0bfa137 LB |
166 | |
167 | return 0; | |
4f86d3a8 LB |
168 | } |
169 | ||
170 | /** | |
171 | * cpuidle_install_idle_handler - installs the cpuidle idle loop handler | |
172 | */ | |
173 | void cpuidle_install_idle_handler(void) | |
174 | { | |
a0bfa137 | 175 | if (enabled_devices) { |
4f86d3a8 LB |
176 | /* Make sure all changes finished before we switch to new idle */ |
177 | smp_wmb(); | |
a0bfa137 | 178 | initialized = 1; |
4f86d3a8 LB |
179 | } |
180 | } | |
181 | ||
182 | /** | |
183 | * cpuidle_uninstall_idle_handler - uninstalls the cpuidle idle loop handler | |
184 | */ | |
185 | void cpuidle_uninstall_idle_handler(void) | |
186 | { | |
a0bfa137 LB |
187 | if (enabled_devices) { |
188 | initialized = 0; | |
4a162513 | 189 | kick_all_cpus_sync(); |
4f86d3a8 LB |
190 | } |
191 | } | |
192 | ||
193 | /** | |
194 | * cpuidle_pause_and_lock - temporarily disables CPUIDLE | |
195 | */ | |
196 | void cpuidle_pause_and_lock(void) | |
197 | { | |
198 | mutex_lock(&cpuidle_lock); | |
199 | cpuidle_uninstall_idle_handler(); | |
200 | } | |
201 | ||
202 | EXPORT_SYMBOL_GPL(cpuidle_pause_and_lock); | |
203 | ||
204 | /** | |
205 | * cpuidle_resume_and_unlock - resumes CPUIDLE operation | |
206 | */ | |
207 | void cpuidle_resume_and_unlock(void) | |
208 | { | |
209 | cpuidle_install_idle_handler(); | |
210 | mutex_unlock(&cpuidle_lock); | |
211 | } | |
212 | ||
213 | EXPORT_SYMBOL_GPL(cpuidle_resume_and_unlock); | |
214 | ||
8651f97b PM |
215 | /* Currently used in suspend/resume path to suspend cpuidle */ |
216 | void cpuidle_pause(void) | |
217 | { | |
218 | mutex_lock(&cpuidle_lock); | |
219 | cpuidle_uninstall_idle_handler(); | |
220 | mutex_unlock(&cpuidle_lock); | |
221 | } | |
222 | ||
223 | /* Currently used in suspend/resume path to resume cpuidle */ | |
224 | void cpuidle_resume(void) | |
225 | { | |
226 | mutex_lock(&cpuidle_lock); | |
227 | cpuidle_install_idle_handler(); | |
228 | mutex_unlock(&cpuidle_lock); | |
229 | } | |
230 | ||
4f86d3a8 LB |
231 | /** |
232 | * cpuidle_enable_device - enables idle PM for a CPU | |
233 | * @dev: the CPU | |
234 | * | |
235 | * This function must be called between cpuidle_pause_and_lock and | |
236 | * cpuidle_resume_and_unlock when used externally. | |
237 | */ | |
238 | int cpuidle_enable_device(struct cpuidle_device *dev) | |
239 | { | |
5df0aa73 | 240 | int ret; |
bf4d1b5d | 241 | struct cpuidle_driver *drv; |
4f86d3a8 | 242 | |
1b0a0e9a SB |
243 | if (!dev) |
244 | return -EINVAL; | |
245 | ||
4f86d3a8 LB |
246 | if (dev->enabled) |
247 | return 0; | |
bf4d1b5d DL |
248 | |
249 | drv = cpuidle_get_cpu_driver(dev); | |
250 | ||
e1689795 | 251 | if (!drv || !cpuidle_curr_governor) |
4f86d3a8 | 252 | return -EIO; |
bf4d1b5d | 253 | |
10b9d3f8 DL |
254 | if (!dev->registered) |
255 | return -EINVAL; | |
256 | ||
4f86d3a8 | 257 | if (!dev->state_count) |
fc850f39 | 258 | dev->state_count = drv->state_count; |
4f86d3a8 | 259 | |
bf4d1b5d DL |
260 | ret = cpuidle_add_device_sysfs(dev); |
261 | if (ret) | |
4f86d3a8 LB |
262 | return ret; |
263 | ||
264 | if (cpuidle_curr_governor->enable && | |
e1689795 | 265 | (ret = cpuidle_curr_governor->enable(drv, dev))) |
4f86d3a8 LB |
266 | goto fail_sysfs; |
267 | ||
4f86d3a8 LB |
268 | smp_wmb(); |
269 | ||
270 | dev->enabled = 1; | |
271 | ||
272 | enabled_devices++; | |
273 | return 0; | |
274 | ||
275 | fail_sysfs: | |
bf4d1b5d | 276 | cpuidle_remove_device_sysfs(dev); |
4f86d3a8 LB |
277 | |
278 | return ret; | |
279 | } | |
280 | ||
281 | EXPORT_SYMBOL_GPL(cpuidle_enable_device); | |
282 | ||
283 | /** | |
284 | * cpuidle_disable_device - disables idle PM for a CPU | |
285 | * @dev: the CPU | |
286 | * | |
287 | * This function must be called between cpuidle_pause_and_lock and | |
288 | * cpuidle_resume_and_unlock when used externally. | |
289 | */ | |
290 | void cpuidle_disable_device(struct cpuidle_device *dev) | |
291 | { | |
bf4d1b5d DL |
292 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); |
293 | ||
cf31cd1a | 294 | if (!dev || !dev->enabled) |
4f86d3a8 | 295 | return; |
bf4d1b5d DL |
296 | |
297 | if (!drv || !cpuidle_curr_governor) | |
4f86d3a8 LB |
298 | return; |
299 | ||
300 | dev->enabled = 0; | |
301 | ||
302 | if (cpuidle_curr_governor->disable) | |
bf4d1b5d | 303 | cpuidle_curr_governor->disable(drv, dev); |
4f86d3a8 | 304 | |
bf4d1b5d | 305 | cpuidle_remove_device_sysfs(dev); |
4f86d3a8 LB |
306 | enabled_devices--; |
307 | } | |
308 | ||
309 | EXPORT_SYMBOL_GPL(cpuidle_disable_device); | |
310 | ||
f6bb51a5 DL |
311 | static void __cpuidle_unregister_device(struct cpuidle_device *dev) |
312 | { | |
313 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); | |
314 | ||
315 | list_del(&dev->device_list); | |
316 | per_cpu(cpuidle_devices, dev->cpu) = NULL; | |
317 | module_put(drv->owner); | |
318 | } | |
319 | ||
267d4bf8 | 320 | static void __cpuidle_device_init(struct cpuidle_device *dev) |
5df0aa73 DL |
321 | { |
322 | memset(dev->states_usage, 0, sizeof(dev->states_usage)); | |
323 | dev->last_residency = 0; | |
5df0aa73 DL |
324 | } |
325 | ||
4f86d3a8 | 326 | /** |
dcb84f33 VP |
327 | * __cpuidle_register_device - internal register function called before register |
328 | * and enable routines | |
4f86d3a8 | 329 | * @dev: the cpu |
dcb84f33 VP |
330 | * |
331 | * cpuidle_lock mutex must be held before this is called | |
4f86d3a8 | 332 | */ |
dcb84f33 | 333 | static int __cpuidle_register_device(struct cpuidle_device *dev) |
4f86d3a8 LB |
334 | { |
335 | int ret; | |
bf4d1b5d | 336 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); |
4f86d3a8 | 337 | |
bf4d1b5d | 338 | if (!try_module_get(drv->owner)) |
4f86d3a8 LB |
339 | return -EINVAL; |
340 | ||
4f86d3a8 LB |
341 | per_cpu(cpuidle_devices, dev->cpu) = dev; |
342 | list_add(&dev->device_list, &cpuidle_detected_devices); | |
4f86d3a8 | 343 | |
4126c019 | 344 | ret = cpuidle_coupled_register_device(dev); |
47182668 | 345 | if (ret) |
f6bb51a5 | 346 | __cpuidle_unregister_device(dev); |
47182668 VK |
347 | else |
348 | dev->registered = 1; | |
4f86d3a8 | 349 | |
47182668 | 350 | return ret; |
dcb84f33 VP |
351 | } |
352 | ||
353 | /** | |
354 | * cpuidle_register_device - registers a CPU's idle PM feature | |
355 | * @dev: the cpu | |
356 | */ | |
357 | int cpuidle_register_device(struct cpuidle_device *dev) | |
358 | { | |
c878a52d | 359 | int ret = -EBUSY; |
dcb84f33 | 360 | |
1b0a0e9a SB |
361 | if (!dev) |
362 | return -EINVAL; | |
363 | ||
dcb84f33 VP |
364 | mutex_lock(&cpuidle_lock); |
365 | ||
c878a52d DL |
366 | if (dev->registered) |
367 | goto out_unlock; | |
368 | ||
267d4bf8 | 369 | __cpuidle_device_init(dev); |
5df0aa73 | 370 | |
f6bb51a5 DL |
371 | ret = __cpuidle_register_device(dev); |
372 | if (ret) | |
373 | goto out_unlock; | |
374 | ||
375 | ret = cpuidle_add_sysfs(dev); | |
376 | if (ret) | |
377 | goto out_unregister; | |
dcb84f33 | 378 | |
10b9d3f8 | 379 | ret = cpuidle_enable_device(dev); |
f6bb51a5 DL |
380 | if (ret) |
381 | goto out_sysfs; | |
10b9d3f8 | 382 | |
4f86d3a8 LB |
383 | cpuidle_install_idle_handler(); |
384 | ||
f6bb51a5 | 385 | out_unlock: |
4f86d3a8 LB |
386 | mutex_unlock(&cpuidle_lock); |
387 | ||
f6bb51a5 DL |
388 | return ret; |
389 | ||
390 | out_sysfs: | |
391 | cpuidle_remove_sysfs(dev); | |
392 | out_unregister: | |
393 | __cpuidle_unregister_device(dev); | |
394 | goto out_unlock; | |
4f86d3a8 LB |
395 | } |
396 | ||
397 | EXPORT_SYMBOL_GPL(cpuidle_register_device); | |
398 | ||
399 | /** | |
400 | * cpuidle_unregister_device - unregisters a CPU's idle PM feature | |
401 | * @dev: the cpu | |
402 | */ | |
403 | void cpuidle_unregister_device(struct cpuidle_device *dev) | |
404 | { | |
813e8e3d | 405 | if (!dev || dev->registered == 0) |
dcb84f33 VP |
406 | return; |
407 | ||
4f86d3a8 LB |
408 | cpuidle_pause_and_lock(); |
409 | ||
410 | cpuidle_disable_device(dev); | |
411 | ||
1aef40e2 | 412 | cpuidle_remove_sysfs(dev); |
f6bb51a5 DL |
413 | |
414 | __cpuidle_unregister_device(dev); | |
4f86d3a8 | 415 | |
4126c019 CC |
416 | cpuidle_coupled_unregister_device(dev); |
417 | ||
4f86d3a8 | 418 | cpuidle_resume_and_unlock(); |
4f86d3a8 LB |
419 | } |
420 | ||
421 | EXPORT_SYMBOL_GPL(cpuidle_unregister_device); | |
422 | ||
1c192d04 | 423 | /** |
4c637b21 DL |
424 | * cpuidle_unregister: unregister a driver and the devices. This function |
425 | * can be used only if the driver has been previously registered through | |
426 | * the cpuidle_register function. | |
427 | * | |
428 | * @drv: a valid pointer to a struct cpuidle_driver | |
429 | */ | |
430 | void cpuidle_unregister(struct cpuidle_driver *drv) | |
431 | { | |
432 | int cpu; | |
433 | struct cpuidle_device *device; | |
434 | ||
82467a5a | 435 | for_each_cpu(cpu, drv->cpumask) { |
4c637b21 DL |
436 | device = &per_cpu(cpuidle_dev, cpu); |
437 | cpuidle_unregister_device(device); | |
438 | } | |
439 | ||
440 | cpuidle_unregister_driver(drv); | |
441 | } | |
442 | EXPORT_SYMBOL_GPL(cpuidle_unregister); | |
443 | ||
444 | /** | |
445 | * cpuidle_register: registers the driver and the cpu devices with the | |
446 | * coupled_cpus passed as parameter. This function is used for all common | |
447 | * initialization pattern there are in the arch specific drivers. The | |
448 | * devices is globally defined in this file. | |
449 | * | |
450 | * @drv : a valid pointer to a struct cpuidle_driver | |
451 | * @coupled_cpus: a cpumask for the coupled states | |
452 | * | |
453 | * Returns 0 on success, < 0 otherwise | |
454 | */ | |
455 | int cpuidle_register(struct cpuidle_driver *drv, | |
456 | const struct cpumask *const coupled_cpus) | |
457 | { | |
458 | int ret, cpu; | |
459 | struct cpuidle_device *device; | |
460 | ||
461 | ret = cpuidle_register_driver(drv); | |
462 | if (ret) { | |
463 | pr_err("failed to register cpuidle driver\n"); | |
464 | return ret; | |
465 | } | |
466 | ||
82467a5a | 467 | for_each_cpu(cpu, drv->cpumask) { |
4c637b21 DL |
468 | device = &per_cpu(cpuidle_dev, cpu); |
469 | device->cpu = cpu; | |
470 | ||
471 | #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED | |
472 | /* | |
caf4a36e | 473 | * On multiplatform for ARM, the coupled idle states could be |
4c637b21 DL |
474 | * enabled in the kernel even if the cpuidle driver does not |
475 | * use it. Note, coupled_cpus is a struct copy. | |
476 | */ | |
477 | if (coupled_cpus) | |
478 | device->coupled_cpus = *coupled_cpus; | |
479 | #endif | |
480 | ret = cpuidle_register_device(device); | |
481 | if (!ret) | |
482 | continue; | |
483 | ||
484 | pr_err("Failed to register cpuidle device for cpu%d\n", cpu); | |
485 | ||
486 | cpuidle_unregister(drv); | |
487 | break; | |
488 | } | |
489 | ||
490 | return ret; | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(cpuidle_register); | |
493 | ||
4f86d3a8 LB |
494 | #ifdef CONFIG_SMP |
495 | ||
496 | static void smp_callback(void *v) | |
497 | { | |
498 | /* we already woke the CPU up, nothing more to do */ | |
499 | } | |
500 | ||
501 | /* | |
502 | * This function gets called when a part of the kernel has a new latency | |
503 | * requirement. This means we need to get all processors out of their C-state, | |
504 | * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that | |
505 | * wakes them all right up. | |
506 | */ | |
507 | static int cpuidle_latency_notify(struct notifier_block *b, | |
508 | unsigned long l, void *v) | |
509 | { | |
8691e5a8 | 510 | smp_call_function(smp_callback, NULL, 1); |
4f86d3a8 LB |
511 | return NOTIFY_OK; |
512 | } | |
513 | ||
514 | static struct notifier_block cpuidle_latency_notifier = { | |
515 | .notifier_call = cpuidle_latency_notify, | |
516 | }; | |
517 | ||
d82b3518 MG |
518 | static inline void latency_notifier_init(struct notifier_block *n) |
519 | { | |
520 | pm_qos_add_notifier(PM_QOS_CPU_DMA_LATENCY, n); | |
521 | } | |
4f86d3a8 LB |
522 | |
523 | #else /* CONFIG_SMP */ | |
524 | ||
525 | #define latency_notifier_init(x) do { } while (0) | |
526 | ||
527 | #endif /* CONFIG_SMP */ | |
528 | ||
529 | /** | |
530 | * cpuidle_init - core initializer | |
531 | */ | |
532 | static int __init cpuidle_init(void) | |
533 | { | |
534 | int ret; | |
535 | ||
62027aea LB |
536 | if (cpuidle_disabled()) |
537 | return -ENODEV; | |
538 | ||
8a25a2fd | 539 | ret = cpuidle_add_interface(cpu_subsys.dev_root); |
4f86d3a8 LB |
540 | if (ret) |
541 | return ret; | |
542 | ||
543 | latency_notifier_init(&cpuidle_latency_notifier); | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
62027aea | 548 | module_param(off, int, 0444); |
4f86d3a8 | 549 | core_initcall(cpuidle_init); |