Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/vtime.c | |
3 | * Virtual cpu timer based timer functions. | |
4 | * | |
5 | * S390 version | |
6 | * Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
7 | * Author(s): Jan Glauber <jan.glauber@de.ibm.com> | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/time.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/smp.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/timex.h> | |
18 | #include <linux/notifier.h> | |
19 | #include <linux/kernel_stat.h> | |
20 | #include <linux/rcupdate.h> | |
21 | #include <linux/posix-timers.h> | |
22 | ||
23 | #include <asm/s390_ext.h> | |
24 | #include <asm/timer.h> | |
5a489b98 | 25 | #include <asm/irq_regs.h> |
1da177e4 | 26 | |
1da177e4 | 27 | static ext_int_info_t ext_int_info_timer; |
2b67fc46 | 28 | static DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer); |
1da177e4 LT |
29 | |
30 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING | |
31 | /* | |
32 | * Update process times based on virtual cpu times stored by entry.S | |
33 | * to the lowcore fields user_timer, system_timer & steal_clock. | |
34 | */ | |
1f1c12af | 35 | void account_tick_vtime(struct task_struct *tsk) |
1da177e4 LT |
36 | { |
37 | cputime_t cputime; | |
38 | __u64 timer, clock; | |
39 | int rcu_user_flag; | |
40 | ||
41 | timer = S390_lowcore.last_update_timer; | |
42 | clock = S390_lowcore.last_update_clock; | |
43 | asm volatile (" STPT %0\n" /* Store current cpu timer value */ | |
44 | " STCK %1" /* Store current tod clock value */ | |
45 | : "=m" (S390_lowcore.last_update_timer), | |
46 | "=m" (S390_lowcore.last_update_clock) ); | |
47 | S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer; | |
48 | S390_lowcore.steal_clock += S390_lowcore.last_update_clock - clock; | |
49 | ||
50 | cputime = S390_lowcore.user_timer >> 12; | |
51 | rcu_user_flag = cputime != 0; | |
52 | S390_lowcore.user_timer -= cputime << 12; | |
53 | S390_lowcore.steal_clock -= cputime << 12; | |
54 | account_user_time(tsk, cputime); | |
55 | ||
56 | cputime = S390_lowcore.system_timer >> 12; | |
57 | S390_lowcore.system_timer -= cputime << 12; | |
58 | S390_lowcore.steal_clock -= cputime << 12; | |
59 | account_system_time(tsk, HARDIRQ_OFFSET, cputime); | |
60 | ||
61 | cputime = S390_lowcore.steal_clock; | |
62 | if ((__s64) cputime > 0) { | |
63 | cputime >>= 12; | |
64 | S390_lowcore.steal_clock -= cputime << 12; | |
65 | account_steal_time(tsk, cputime); | |
66 | } | |
67 | ||
68 | run_local_timers(); | |
69 | if (rcu_pending(smp_processor_id())) | |
70 | rcu_check_callbacks(smp_processor_id(), rcu_user_flag); | |
71 | scheduler_tick(); | |
72 | run_posix_cpu_timers(tsk); | |
73 | } | |
74 | ||
1f1c12af MS |
75 | /* |
76 | * Update process times based on virtual cpu times stored by entry.S | |
77 | * to the lowcore fields user_timer, system_timer & steal_clock. | |
78 | */ | |
79 | void account_vtime(struct task_struct *tsk) | |
80 | { | |
81 | cputime_t cputime; | |
82 | __u64 timer; | |
83 | ||
84 | timer = S390_lowcore.last_update_timer; | |
85 | asm volatile (" STPT %0" /* Store current cpu timer value */ | |
86 | : "=m" (S390_lowcore.last_update_timer) ); | |
87 | S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer; | |
88 | ||
89 | cputime = S390_lowcore.user_timer >> 12; | |
90 | S390_lowcore.user_timer -= cputime << 12; | |
91 | S390_lowcore.steal_clock -= cputime << 12; | |
92 | account_user_time(tsk, cputime); | |
93 | ||
94 | cputime = S390_lowcore.system_timer >> 12; | |
95 | S390_lowcore.system_timer -= cputime << 12; | |
96 | S390_lowcore.steal_clock -= cputime << 12; | |
97 | account_system_time(tsk, 0, cputime); | |
98 | } | |
99 | ||
1da177e4 LT |
100 | /* |
101 | * Update process times based on virtual cpu times stored by entry.S | |
102 | * to the lowcore fields user_timer, system_timer & steal_clock. | |
103 | */ | |
104 | void account_system_vtime(struct task_struct *tsk) | |
105 | { | |
106 | cputime_t cputime; | |
107 | __u64 timer; | |
108 | ||
109 | timer = S390_lowcore.last_update_timer; | |
110 | asm volatile (" STPT %0" /* Store current cpu timer value */ | |
111 | : "=m" (S390_lowcore.last_update_timer) ); | |
112 | S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer; | |
113 | ||
114 | cputime = S390_lowcore.system_timer >> 12; | |
115 | S390_lowcore.system_timer -= cputime << 12; | |
116 | S390_lowcore.steal_clock -= cputime << 12; | |
117 | account_system_time(tsk, 0, cputime); | |
118 | } | |
119 | ||
120 | static inline void set_vtimer(__u64 expires) | |
121 | { | |
122 | __u64 timer; | |
123 | ||
124 | asm volatile (" STPT %0\n" /* Store current cpu timer value */ | |
125 | " SPT %1" /* Set new value immediatly afterwards */ | |
126 | : "=m" (timer) : "m" (expires) ); | |
127 | S390_lowcore.system_timer += S390_lowcore.last_update_timer - timer; | |
128 | S390_lowcore.last_update_timer = expires; | |
129 | ||
130 | /* store expire time for this CPU timer */ | |
db77aa5f | 131 | __get_cpu_var(virt_cpu_timer).to_expire = expires; |
1da177e4 LT |
132 | } |
133 | #else | |
134 | static inline void set_vtimer(__u64 expires) | |
135 | { | |
136 | S390_lowcore.last_update_timer = expires; | |
137 | asm volatile ("SPT %0" : : "m" (S390_lowcore.last_update_timer)); | |
138 | ||
139 | /* store expire time for this CPU timer */ | |
db77aa5f | 140 | __get_cpu_var(virt_cpu_timer).to_expire = expires; |
1da177e4 LT |
141 | } |
142 | #endif | |
143 | ||
144 | static void start_cpu_timer(void) | |
145 | { | |
146 | struct vtimer_queue *vt_list; | |
147 | ||
db77aa5f | 148 | vt_list = &__get_cpu_var(virt_cpu_timer); |
4b7e0706 MS |
149 | |
150 | /* CPU timer interrupt is pending, don't reprogramm it */ | |
151 | if (vt_list->idle & 1LL<<63) | |
152 | return; | |
153 | ||
154 | if (!list_empty(&vt_list->list)) | |
155 | set_vtimer(vt_list->idle); | |
1da177e4 LT |
156 | } |
157 | ||
158 | static void stop_cpu_timer(void) | |
159 | { | |
1da177e4 LT |
160 | struct vtimer_queue *vt_list; |
161 | ||
db77aa5f | 162 | vt_list = &__get_cpu_var(virt_cpu_timer); |
1da177e4 LT |
163 | |
164 | /* nothing to do */ | |
165 | if (list_empty(&vt_list->list)) { | |
166 | vt_list->idle = VTIMER_MAX_SLICE; | |
167 | goto fire; | |
168 | } | |
169 | ||
4b7e0706 MS |
170 | /* store the actual expire value */ |
171 | asm volatile ("STPT %0" : "=m" (vt_list->idle)); | |
1da177e4 LT |
172 | |
173 | /* | |
4b7e0706 MS |
174 | * If the CPU timer is negative we don't reprogramm |
175 | * it because we will get instantly an interrupt. | |
1da177e4 | 176 | */ |
4b7e0706 | 177 | if (vt_list->idle & 1LL<<63) |
1da177e4 | 178 | return; |
1da177e4 | 179 | |
4b7e0706 | 180 | vt_list->offset += vt_list->to_expire - vt_list->idle; |
1da177e4 LT |
181 | |
182 | /* | |
183 | * We cannot halt the CPU timer, we just write a value that | |
184 | * nearly never expires (only after 71 years) and re-write | |
185 | * the stored expire value if we continue the timer | |
186 | */ | |
187 | fire: | |
188 | set_vtimer(VTIMER_MAX_SLICE); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Sorted add to a list. List is linear searched until first bigger | |
193 | * element is found. | |
194 | */ | |
195 | static void list_add_sorted(struct vtimer_list *timer, struct list_head *head) | |
196 | { | |
197 | struct vtimer_list *event; | |
198 | ||
199 | list_for_each_entry(event, head, entry) { | |
200 | if (event->expires > timer->expires) { | |
201 | list_add_tail(&timer->entry, &event->entry); | |
202 | return; | |
203 | } | |
204 | } | |
205 | list_add_tail(&timer->entry, head); | |
206 | } | |
207 | ||
208 | /* | |
209 | * Do the callback functions of expired vtimer events. | |
210 | * Called from within the interrupt handler. | |
211 | */ | |
9d0a57cb | 212 | static void do_callbacks(struct list_head *cb_list) |
1da177e4 LT |
213 | { |
214 | struct vtimer_queue *vt_list; | |
215 | struct vtimer_list *event, *tmp; | |
9d0a57cb | 216 | void (*fn)(unsigned long); |
1da177e4 LT |
217 | unsigned long data; |
218 | ||
219 | if (list_empty(cb_list)) | |
220 | return; | |
221 | ||
db77aa5f | 222 | vt_list = &__get_cpu_var(virt_cpu_timer); |
1da177e4 LT |
223 | |
224 | list_for_each_entry_safe(event, tmp, cb_list, entry) { | |
225 | fn = event->function; | |
226 | data = event->data; | |
9d0a57cb | 227 | fn(data); |
1da177e4 LT |
228 | |
229 | if (!event->interval) | |
230 | /* delete one shot timer */ | |
231 | list_del_init(&event->entry); | |
232 | else { | |
233 | /* move interval timer back to list */ | |
234 | spin_lock(&vt_list->lock); | |
235 | list_del_init(&event->entry); | |
236 | list_add_sorted(event, &vt_list->list); | |
237 | spin_unlock(&vt_list->lock); | |
238 | } | |
239 | } | |
240 | } | |
241 | ||
242 | /* | |
243 | * Handler for the virtual CPU timer. | |
244 | */ | |
5a489b98 | 245 | static void do_cpu_timer_interrupt(__u16 error_code) |
1da177e4 | 246 | { |
1da177e4 LT |
247 | __u64 next, delta; |
248 | struct vtimer_queue *vt_list; | |
249 | struct vtimer_list *event, *tmp; | |
250 | struct list_head *ptr; | |
251 | /* the callback queue */ | |
252 | struct list_head cb_list; | |
253 | ||
254 | INIT_LIST_HEAD(&cb_list); | |
db77aa5f | 255 | vt_list = &__get_cpu_var(virt_cpu_timer); |
1da177e4 LT |
256 | |
257 | /* walk timer list, fire all expired events */ | |
258 | spin_lock(&vt_list->lock); | |
259 | ||
260 | if (vt_list->to_expire < VTIMER_MAX_SLICE) | |
261 | vt_list->offset += vt_list->to_expire; | |
262 | ||
263 | list_for_each_entry_safe(event, tmp, &vt_list->list, entry) { | |
264 | if (event->expires > vt_list->offset) | |
265 | /* found first unexpired event, leave */ | |
266 | break; | |
267 | ||
268 | /* re-charge interval timer, we have to add the offset */ | |
269 | if (event->interval) | |
270 | event->expires = event->interval + vt_list->offset; | |
271 | ||
272 | /* move expired timer to the callback queue */ | |
273 | list_move_tail(&event->entry, &cb_list); | |
274 | } | |
275 | spin_unlock(&vt_list->lock); | |
9d0a57cb | 276 | do_callbacks(&cb_list); |
1da177e4 LT |
277 | |
278 | /* next event is first in list */ | |
279 | spin_lock(&vt_list->lock); | |
280 | if (!list_empty(&vt_list->list)) { | |
281 | ptr = vt_list->list.next; | |
282 | event = list_entry(ptr, struct vtimer_list, entry); | |
283 | next = event->expires - vt_list->offset; | |
284 | ||
285 | /* add the expired time from this interrupt handler | |
286 | * and the callback functions | |
287 | */ | |
288 | asm volatile ("STPT %0" : "=m" (delta)); | |
289 | delta = 0xffffffffffffffffLL - delta + 1; | |
290 | vt_list->offset += delta; | |
291 | next -= delta; | |
292 | } else { | |
293 | vt_list->offset = 0; | |
294 | next = VTIMER_MAX_SLICE; | |
295 | } | |
296 | spin_unlock(&vt_list->lock); | |
297 | set_vtimer(next); | |
298 | } | |
299 | ||
300 | void init_virt_timer(struct vtimer_list *timer) | |
301 | { | |
1da177e4 LT |
302 | timer->function = NULL; |
303 | INIT_LIST_HEAD(&timer->entry); | |
304 | spin_lock_init(&timer->lock); | |
305 | } | |
306 | EXPORT_SYMBOL(init_virt_timer); | |
307 | ||
1da177e4 LT |
308 | static inline int vtimer_pending(struct vtimer_list *timer) |
309 | { | |
310 | return (!list_empty(&timer->entry)); | |
311 | } | |
312 | ||
313 | /* | |
314 | * this function should only run on the specified CPU | |
315 | */ | |
316 | static void internal_add_vtimer(struct vtimer_list *timer) | |
317 | { | |
318 | unsigned long flags; | |
319 | __u64 done; | |
320 | struct vtimer_list *event; | |
321 | struct vtimer_queue *vt_list; | |
322 | ||
323 | vt_list = &per_cpu(virt_cpu_timer, timer->cpu); | |
324 | spin_lock_irqsave(&vt_list->lock, flags); | |
325 | ||
326 | if (timer->cpu != smp_processor_id()) | |
327 | printk("internal_add_vtimer: BUG, running on wrong CPU"); | |
328 | ||
329 | /* if list is empty we only have to set the timer */ | |
330 | if (list_empty(&vt_list->list)) { | |
331 | /* reset the offset, this may happen if the last timer was | |
332 | * just deleted by mod_virt_timer and the interrupt | |
333 | * didn't happen until here | |
334 | */ | |
335 | vt_list->offset = 0; | |
336 | goto fire; | |
337 | } | |
338 | ||
339 | /* save progress */ | |
340 | asm volatile ("STPT %0" : "=m" (done)); | |
341 | ||
342 | /* calculate completed work */ | |
343 | done = vt_list->to_expire - done + vt_list->offset; | |
344 | vt_list->offset = 0; | |
345 | ||
346 | list_for_each_entry(event, &vt_list->list, entry) | |
347 | event->expires -= done; | |
348 | ||
349 | fire: | |
350 | list_add_sorted(timer, &vt_list->list); | |
351 | ||
352 | /* get first element, which is the next vtimer slice */ | |
353 | event = list_entry(vt_list->list.next, struct vtimer_list, entry); | |
354 | ||
355 | set_vtimer(event->expires); | |
356 | spin_unlock_irqrestore(&vt_list->lock, flags); | |
d6e05edc | 357 | /* release CPU acquired in prepare_vtimer or mod_virt_timer() */ |
1da177e4 LT |
358 | put_cpu(); |
359 | } | |
360 | ||
361 | static inline int prepare_vtimer(struct vtimer_list *timer) | |
362 | { | |
dfc4f94d | 363 | if (!timer->function) { |
1da177e4 LT |
364 | printk("add_virt_timer: uninitialized timer\n"); |
365 | return -EINVAL; | |
366 | } | |
367 | ||
368 | if (!timer->expires || timer->expires > VTIMER_MAX_SLICE) { | |
369 | printk("add_virt_timer: invalid timer expire value!\n"); | |
370 | return -EINVAL; | |
371 | } | |
372 | ||
373 | if (vtimer_pending(timer)) { | |
374 | printk("add_virt_timer: timer pending\n"); | |
375 | return -EBUSY; | |
376 | } | |
377 | ||
378 | timer->cpu = get_cpu(); | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* | |
383 | * add_virt_timer - add an oneshot virtual CPU timer | |
384 | */ | |
385 | void add_virt_timer(void *new) | |
386 | { | |
387 | struct vtimer_list *timer; | |
388 | ||
389 | timer = (struct vtimer_list *)new; | |
390 | ||
391 | if (prepare_vtimer(timer) < 0) | |
392 | return; | |
393 | ||
394 | timer->interval = 0; | |
395 | internal_add_vtimer(timer); | |
396 | } | |
397 | EXPORT_SYMBOL(add_virt_timer); | |
398 | ||
399 | /* | |
400 | * add_virt_timer_int - add an interval virtual CPU timer | |
401 | */ | |
402 | void add_virt_timer_periodic(void *new) | |
403 | { | |
404 | struct vtimer_list *timer; | |
405 | ||
406 | timer = (struct vtimer_list *)new; | |
407 | ||
408 | if (prepare_vtimer(timer) < 0) | |
409 | return; | |
410 | ||
411 | timer->interval = timer->expires; | |
412 | internal_add_vtimer(timer); | |
413 | } | |
414 | EXPORT_SYMBOL(add_virt_timer_periodic); | |
415 | ||
416 | /* | |
417 | * If we change a pending timer the function must be called on the CPU | |
3bb447fc | 418 | * where the timer is running on, e.g. by smp_call_function_single() |
1da177e4 LT |
419 | * |
420 | * The original mod_timer adds the timer if it is not pending. For compatibility | |
421 | * we do the same. The timer will be added on the current CPU as a oneshot timer. | |
422 | * | |
423 | * returns whether it has modified a pending timer (1) or not (0) | |
424 | */ | |
425 | int mod_virt_timer(struct vtimer_list *timer, __u64 expires) | |
426 | { | |
427 | struct vtimer_queue *vt_list; | |
428 | unsigned long flags; | |
429 | int cpu; | |
430 | ||
dfc4f94d | 431 | if (!timer->function) { |
1da177e4 LT |
432 | printk("mod_virt_timer: uninitialized timer\n"); |
433 | return -EINVAL; | |
434 | } | |
435 | ||
436 | if (!expires || expires > VTIMER_MAX_SLICE) { | |
437 | printk("mod_virt_timer: invalid expire range\n"); | |
438 | return -EINVAL; | |
439 | } | |
440 | ||
441 | /* | |
442 | * This is a common optimization triggered by the | |
443 | * networking code - if the timer is re-modified | |
444 | * to be the same thing then just return: | |
445 | */ | |
446 | if (timer->expires == expires && vtimer_pending(timer)) | |
447 | return 1; | |
448 | ||
449 | cpu = get_cpu(); | |
450 | vt_list = &per_cpu(virt_cpu_timer, cpu); | |
451 | ||
452 | /* disable interrupts before test if timer is pending */ | |
453 | spin_lock_irqsave(&vt_list->lock, flags); | |
454 | ||
455 | /* if timer isn't pending add it on the current CPU */ | |
456 | if (!vtimer_pending(timer)) { | |
457 | spin_unlock_irqrestore(&vt_list->lock, flags); | |
458 | /* we do not activate an interval timer with mod_virt_timer */ | |
459 | timer->interval = 0; | |
460 | timer->expires = expires; | |
461 | timer->cpu = cpu; | |
462 | internal_add_vtimer(timer); | |
463 | return 0; | |
464 | } | |
465 | ||
466 | /* check if we run on the right CPU */ | |
467 | if (timer->cpu != cpu) { | |
468 | printk("mod_virt_timer: running on wrong CPU, check your code\n"); | |
469 | spin_unlock_irqrestore(&vt_list->lock, flags); | |
470 | put_cpu(); | |
471 | return -EINVAL; | |
472 | } | |
473 | ||
474 | list_del_init(&timer->entry); | |
475 | timer->expires = expires; | |
476 | ||
477 | /* also change the interval if we have an interval timer */ | |
478 | if (timer->interval) | |
479 | timer->interval = expires; | |
480 | ||
481 | /* the timer can't expire anymore so we can release the lock */ | |
482 | spin_unlock_irqrestore(&vt_list->lock, flags); | |
483 | internal_add_vtimer(timer); | |
484 | return 1; | |
485 | } | |
486 | EXPORT_SYMBOL(mod_virt_timer); | |
487 | ||
488 | /* | |
489 | * delete a virtual timer | |
490 | * | |
491 | * returns whether the deleted timer was pending (1) or not (0) | |
492 | */ | |
493 | int del_virt_timer(struct vtimer_list *timer) | |
494 | { | |
495 | unsigned long flags; | |
496 | struct vtimer_queue *vt_list; | |
497 | ||
1da177e4 LT |
498 | /* check if timer is pending */ |
499 | if (!vtimer_pending(timer)) | |
500 | return 0; | |
501 | ||
502 | vt_list = &per_cpu(virt_cpu_timer, timer->cpu); | |
503 | spin_lock_irqsave(&vt_list->lock, flags); | |
504 | ||
505 | /* we don't interrupt a running timer, just let it expire! */ | |
506 | list_del_init(&timer->entry); | |
507 | ||
508 | /* last timer removed */ | |
509 | if (list_empty(&vt_list->list)) { | |
510 | vt_list->to_expire = 0; | |
511 | vt_list->offset = 0; | |
512 | } | |
513 | ||
514 | spin_unlock_irqrestore(&vt_list->lock, flags); | |
515 | return 1; | |
516 | } | |
517 | EXPORT_SYMBOL(del_virt_timer); | |
518 | ||
519 | /* | |
520 | * Start the virtual CPU timer on the current CPU. | |
521 | */ | |
522 | void init_cpu_vtimer(void) | |
523 | { | |
524 | struct vtimer_queue *vt_list; | |
1da177e4 LT |
525 | |
526 | /* kick the virtual timer */ | |
527 | S390_lowcore.exit_timer = VTIMER_MAX_SLICE; | |
528 | S390_lowcore.last_update_timer = VTIMER_MAX_SLICE; | |
529 | asm volatile ("SPT %0" : : "m" (S390_lowcore.last_update_timer)); | |
530 | asm volatile ("STCK %0" : "=m" (S390_lowcore.last_update_clock)); | |
d54853ef MS |
531 | |
532 | /* enable cpu timer interrupts */ | |
533 | __ctl_set_bit(0,10); | |
1da177e4 | 534 | |
db77aa5f | 535 | vt_list = &__get_cpu_var(virt_cpu_timer); |
1da177e4 LT |
536 | INIT_LIST_HEAD(&vt_list->list); |
537 | spin_lock_init(&vt_list->lock); | |
538 | vt_list->to_expire = 0; | |
539 | vt_list->offset = 0; | |
540 | vt_list->idle = 0; | |
541 | ||
542 | } | |
543 | ||
544 | static int vtimer_idle_notify(struct notifier_block *self, | |
545 | unsigned long action, void *hcpu) | |
546 | { | |
547 | switch (action) { | |
dce55470 | 548 | case S390_CPU_IDLE: |
1da177e4 LT |
549 | stop_cpu_timer(); |
550 | break; | |
dce55470 | 551 | case S390_CPU_NOT_IDLE: |
1da177e4 LT |
552 | start_cpu_timer(); |
553 | break; | |
554 | } | |
555 | return NOTIFY_OK; | |
556 | } | |
557 | ||
558 | static struct notifier_block vtimer_idle_nb = { | |
559 | .notifier_call = vtimer_idle_notify, | |
560 | }; | |
561 | ||
562 | void __init vtime_init(void) | |
563 | { | |
564 | /* request the cpu timer external interrupt */ | |
565 | if (register_early_external_interrupt(0x1005, do_cpu_timer_interrupt, | |
566 | &ext_int_info_timer) != 0) | |
567 | panic("Couldn't request external interrupt 0x1005"); | |
568 | ||
569 | if (register_idle_notifier(&vtimer_idle_nb)) | |
570 | panic("Couldn't register idle notifier"); | |
571 | ||
d54853ef | 572 | /* Enable cpu timer interrupts on the boot cpu. */ |
1da177e4 LT |
573 | init_cpu_vtimer(); |
574 | } | |
575 |