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1 | /* CPU control. | |
2 | * (C) 2001, 2002, 2003, 2004 Rusty Russell | |
3 | * | |
4 | * This code is licenced under the GPL. | |
5 | */ | |
6 | #include <linux/proc_fs.h> | |
7 | #include <linux/smp.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/notifier.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/unistd.h> | |
12 | #include <linux/cpu.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/kthread.h> | |
15 | #include <linux/stop_machine.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/gfp.h> | |
18 | ||
19 | #ifdef CONFIG_SMP | |
20 | /* Serializes the updates to cpu_online_mask, cpu_present_mask */ | |
21 | static DEFINE_MUTEX(cpu_add_remove_lock); | |
22 | ||
23 | /* | |
24 | * The following two API's must be used when attempting | |
25 | * to serialize the updates to cpu_online_mask, cpu_present_mask. | |
26 | */ | |
27 | void cpu_maps_update_begin(void) | |
28 | { | |
29 | mutex_lock(&cpu_add_remove_lock); | |
30 | } | |
31 | ||
32 | void cpu_maps_update_done(void) | |
33 | { | |
34 | mutex_unlock(&cpu_add_remove_lock); | |
35 | } | |
36 | ||
37 | static RAW_NOTIFIER_HEAD(cpu_chain); | |
38 | ||
39 | /* If set, cpu_up and cpu_down will return -EBUSY and do nothing. | |
40 | * Should always be manipulated under cpu_add_remove_lock | |
41 | */ | |
42 | static int cpu_hotplug_disabled; | |
43 | ||
44 | #ifdef CONFIG_HOTPLUG_CPU | |
45 | ||
46 | static struct { | |
47 | struct task_struct *active_writer; | |
48 | struct mutex lock; /* Synchronizes accesses to refcount, */ | |
49 | /* | |
50 | * Also blocks the new readers during | |
51 | * an ongoing cpu hotplug operation. | |
52 | */ | |
53 | int refcount; | |
54 | } cpu_hotplug = { | |
55 | .active_writer = NULL, | |
56 | .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), | |
57 | .refcount = 0, | |
58 | }; | |
59 | ||
60 | void get_online_cpus(void) | |
61 | { | |
62 | might_sleep(); | |
63 | if (cpu_hotplug.active_writer == current) | |
64 | return; | |
65 | mutex_lock(&cpu_hotplug.lock); | |
66 | cpu_hotplug.refcount++; | |
67 | mutex_unlock(&cpu_hotplug.lock); | |
68 | ||
69 | } | |
70 | EXPORT_SYMBOL_GPL(get_online_cpus); | |
71 | ||
72 | void put_online_cpus(void) | |
73 | { | |
74 | if (cpu_hotplug.active_writer == current) | |
75 | return; | |
76 | mutex_lock(&cpu_hotplug.lock); | |
77 | if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer)) | |
78 | wake_up_process(cpu_hotplug.active_writer); | |
79 | mutex_unlock(&cpu_hotplug.lock); | |
80 | ||
81 | } | |
82 | EXPORT_SYMBOL_GPL(put_online_cpus); | |
83 | ||
84 | /* | |
85 | * This ensures that the hotplug operation can begin only when the | |
86 | * refcount goes to zero. | |
87 | * | |
88 | * Note that during a cpu-hotplug operation, the new readers, if any, | |
89 | * will be blocked by the cpu_hotplug.lock | |
90 | * | |
91 | * Since cpu_hotplug_begin() is always called after invoking | |
92 | * cpu_maps_update_begin(), we can be sure that only one writer is active. | |
93 | * | |
94 | * Note that theoretically, there is a possibility of a livelock: | |
95 | * - Refcount goes to zero, last reader wakes up the sleeping | |
96 | * writer. | |
97 | * - Last reader unlocks the cpu_hotplug.lock. | |
98 | * - A new reader arrives at this moment, bumps up the refcount. | |
99 | * - The writer acquires the cpu_hotplug.lock finds the refcount | |
100 | * non zero and goes to sleep again. | |
101 | * | |
102 | * However, this is very difficult to achieve in practice since | |
103 | * get_online_cpus() not an api which is called all that often. | |
104 | * | |
105 | */ | |
106 | static void cpu_hotplug_begin(void) | |
107 | { | |
108 | cpu_hotplug.active_writer = current; | |
109 | ||
110 | for (;;) { | |
111 | mutex_lock(&cpu_hotplug.lock); | |
112 | if (likely(!cpu_hotplug.refcount)) | |
113 | break; | |
114 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
115 | mutex_unlock(&cpu_hotplug.lock); | |
116 | schedule(); | |
117 | } | |
118 | } | |
119 | ||
120 | static void cpu_hotplug_done(void) | |
121 | { | |
122 | cpu_hotplug.active_writer = NULL; | |
123 | mutex_unlock(&cpu_hotplug.lock); | |
124 | } | |
125 | ||
126 | #else /* #if CONFIG_HOTPLUG_CPU */ | |
127 | static void cpu_hotplug_begin(void) {} | |
128 | static void cpu_hotplug_done(void) {} | |
129 | #endif /* #esle #if CONFIG_HOTPLUG_CPU */ | |
130 | ||
131 | /* Need to know about CPUs going up/down? */ | |
132 | int __ref register_cpu_notifier(struct notifier_block *nb) | |
133 | { | |
134 | int ret; | |
135 | cpu_maps_update_begin(); | |
136 | ret = raw_notifier_chain_register(&cpu_chain, nb); | |
137 | cpu_maps_update_done(); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static int __cpu_notify(unsigned long val, void *v, int nr_to_call, | |
142 | int *nr_calls) | |
143 | { | |
144 | int ret; | |
145 | ||
146 | ret = __raw_notifier_call_chain(&cpu_chain, val, v, nr_to_call, | |
147 | nr_calls); | |
148 | ||
149 | return notifier_to_errno(ret); | |
150 | } | |
151 | ||
152 | static int cpu_notify(unsigned long val, void *v) | |
153 | { | |
154 | return __cpu_notify(val, v, -1, NULL); | |
155 | } | |
156 | ||
157 | #ifdef CONFIG_HOTPLUG_CPU | |
158 | ||
159 | static void cpu_notify_nofail(unsigned long val, void *v) | |
160 | { | |
161 | BUG_ON(cpu_notify(val, v)); | |
162 | } | |
163 | ||
164 | EXPORT_SYMBOL(register_cpu_notifier); | |
165 | ||
166 | void __ref unregister_cpu_notifier(struct notifier_block *nb) | |
167 | { | |
168 | cpu_maps_update_begin(); | |
169 | raw_notifier_chain_unregister(&cpu_chain, nb); | |
170 | cpu_maps_update_done(); | |
171 | } | |
172 | EXPORT_SYMBOL(unregister_cpu_notifier); | |
173 | ||
174 | static inline void check_for_tasks(int cpu) | |
175 | { | |
176 | struct task_struct *p; | |
177 | ||
178 | write_lock_irq(&tasklist_lock); | |
179 | for_each_process(p) { | |
180 | if (task_cpu(p) == cpu && p->state == TASK_RUNNING && | |
181 | (!cputime_eq(p->utime, cputime_zero) || | |
182 | !cputime_eq(p->stime, cputime_zero))) | |
183 | printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d " | |
184 | "(state = %ld, flags = %x)\n", | |
185 | p->comm, task_pid_nr(p), cpu, | |
186 | p->state, p->flags); | |
187 | } | |
188 | write_unlock_irq(&tasklist_lock); | |
189 | } | |
190 | ||
191 | struct take_cpu_down_param { | |
192 | struct task_struct *caller; | |
193 | unsigned long mod; | |
194 | void *hcpu; | |
195 | }; | |
196 | ||
197 | /* Take this CPU down. */ | |
198 | static int __ref take_cpu_down(void *_param) | |
199 | { | |
200 | struct take_cpu_down_param *param = _param; | |
201 | unsigned int cpu = (unsigned long)param->hcpu; | |
202 | int err; | |
203 | ||
204 | /* Ensure this CPU doesn't handle any more interrupts. */ | |
205 | err = __cpu_disable(); | |
206 | if (err < 0) | |
207 | return err; | |
208 | ||
209 | cpu_notify(CPU_DYING | param->mod, param->hcpu); | |
210 | ||
211 | if (task_cpu(param->caller) == cpu) | |
212 | move_task_off_dead_cpu(cpu, param->caller); | |
213 | /* Force idle task to run as soon as we yield: it should | |
214 | immediately notice cpu is offline and die quickly. */ | |
215 | sched_idle_next(); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* Requires cpu_add_remove_lock to be held */ | |
220 | static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) | |
221 | { | |
222 | int err, nr_calls = 0; | |
223 | void *hcpu = (void *)(long)cpu; | |
224 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; | |
225 | struct take_cpu_down_param tcd_param = { | |
226 | .caller = current, | |
227 | .mod = mod, | |
228 | .hcpu = hcpu, | |
229 | }; | |
230 | ||
231 | if (num_online_cpus() == 1) | |
232 | return -EBUSY; | |
233 | ||
234 | if (!cpu_online(cpu)) | |
235 | return -EINVAL; | |
236 | ||
237 | cpu_hotplug_begin(); | |
238 | err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls); | |
239 | if (err) { | |
240 | nr_calls--; | |
241 | __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); | |
242 | printk("%s: attempt to take down CPU %u failed\n", | |
243 | __func__, cpu); | |
244 | goto out_release; | |
245 | } | |
246 | ||
247 | err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); | |
248 | if (err) { | |
249 | /* CPU didn't die: tell everyone. Can't complain. */ | |
250 | cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu); | |
251 | ||
252 | goto out_release; | |
253 | } | |
254 | BUG_ON(cpu_online(cpu)); | |
255 | ||
256 | /* Wait for it to sleep (leaving idle task). */ | |
257 | while (!idle_cpu(cpu)) | |
258 | yield(); | |
259 | ||
260 | /* This actually kills the CPU. */ | |
261 | __cpu_die(cpu); | |
262 | ||
263 | /* CPU is completely dead: tell everyone. Too late to complain. */ | |
264 | cpu_notify_nofail(CPU_DEAD | mod, hcpu); | |
265 | ||
266 | check_for_tasks(cpu); | |
267 | ||
268 | out_release: | |
269 | cpu_hotplug_done(); | |
270 | if (!err) | |
271 | cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); | |
272 | return err; | |
273 | } | |
274 | ||
275 | int __ref cpu_down(unsigned int cpu) | |
276 | { | |
277 | int err; | |
278 | ||
279 | cpu_maps_update_begin(); | |
280 | ||
281 | if (cpu_hotplug_disabled) { | |
282 | err = -EBUSY; | |
283 | goto out; | |
284 | } | |
285 | ||
286 | err = _cpu_down(cpu, 0); | |
287 | ||
288 | out: | |
289 | cpu_maps_update_done(); | |
290 | return err; | |
291 | } | |
292 | EXPORT_SYMBOL(cpu_down); | |
293 | #endif /*CONFIG_HOTPLUG_CPU*/ | |
294 | ||
295 | /* Requires cpu_add_remove_lock to be held */ | |
296 | static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) | |
297 | { | |
298 | int ret, nr_calls = 0; | |
299 | void *hcpu = (void *)(long)cpu; | |
300 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; | |
301 | ||
302 | if (cpu_online(cpu) || !cpu_present(cpu)) | |
303 | return -EINVAL; | |
304 | ||
305 | cpu_hotplug_begin(); | |
306 | ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls); | |
307 | if (ret) { | |
308 | nr_calls--; | |
309 | printk("%s: attempt to bring up CPU %u failed\n", | |
310 | __func__, cpu); | |
311 | goto out_notify; | |
312 | } | |
313 | ||
314 | /* Arch-specific enabling code. */ | |
315 | ret = __cpu_up(cpu); | |
316 | if (ret != 0) | |
317 | goto out_notify; | |
318 | BUG_ON(!cpu_online(cpu)); | |
319 | ||
320 | /* Now call notifier in preparation. */ | |
321 | cpu_notify(CPU_ONLINE | mod, hcpu); | |
322 | ||
323 | out_notify: | |
324 | if (ret != 0) | |
325 | __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); | |
326 | cpu_hotplug_done(); | |
327 | ||
328 | return ret; | |
329 | } | |
330 | ||
331 | int __cpuinit cpu_up(unsigned int cpu) | |
332 | { | |
333 | int err = 0; | |
334 | ||
335 | #ifdef CONFIG_MEMORY_HOTPLUG | |
336 | int nid; | |
337 | pg_data_t *pgdat; | |
338 | #endif | |
339 | ||
340 | if (!cpu_possible(cpu)) { | |
341 | printk(KERN_ERR "can't online cpu %d because it is not " | |
342 | "configured as may-hotadd at boot time\n", cpu); | |
343 | #if defined(CONFIG_IA64) | |
344 | printk(KERN_ERR "please check additional_cpus= boot " | |
345 | "parameter\n"); | |
346 | #endif | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
350 | #ifdef CONFIG_MEMORY_HOTPLUG | |
351 | nid = cpu_to_node(cpu); | |
352 | if (!node_online(nid)) { | |
353 | err = mem_online_node(nid); | |
354 | if (err) | |
355 | return err; | |
356 | } | |
357 | ||
358 | pgdat = NODE_DATA(nid); | |
359 | if (!pgdat) { | |
360 | printk(KERN_ERR | |
361 | "Can't online cpu %d due to NULL pgdat\n", cpu); | |
362 | return -ENOMEM; | |
363 | } | |
364 | ||
365 | if (pgdat->node_zonelists->_zonerefs->zone == NULL) { | |
366 | mutex_lock(&zonelists_mutex); | |
367 | build_all_zonelists(NULL); | |
368 | mutex_unlock(&zonelists_mutex); | |
369 | } | |
370 | #endif | |
371 | ||
372 | cpu_maps_update_begin(); | |
373 | ||
374 | if (cpu_hotplug_disabled) { | |
375 | err = -EBUSY; | |
376 | goto out; | |
377 | } | |
378 | ||
379 | err = _cpu_up(cpu, 0); | |
380 | ||
381 | out: | |
382 | cpu_maps_update_done(); | |
383 | return err; | |
384 | } | |
385 | ||
386 | #ifdef CONFIG_PM_SLEEP_SMP | |
387 | static cpumask_var_t frozen_cpus; | |
388 | ||
389 | int disable_nonboot_cpus(void) | |
390 | { | |
391 | int cpu, first_cpu, error = 0; | |
392 | ||
393 | cpu_maps_update_begin(); | |
394 | first_cpu = cpumask_first(cpu_online_mask); | |
395 | /* | |
396 | * We take down all of the non-boot CPUs in one shot to avoid races | |
397 | * with the userspace trying to use the CPU hotplug at the same time | |
398 | */ | |
399 | cpumask_clear(frozen_cpus); | |
400 | ||
401 | printk("Disabling non-boot CPUs ...\n"); | |
402 | for_each_online_cpu(cpu) { | |
403 | if (cpu == first_cpu) | |
404 | continue; | |
405 | error = _cpu_down(cpu, 1); | |
406 | if (!error) | |
407 | cpumask_set_cpu(cpu, frozen_cpus); | |
408 | else { | |
409 | printk(KERN_ERR "Error taking CPU%d down: %d\n", | |
410 | cpu, error); | |
411 | break; | |
412 | } | |
413 | } | |
414 | ||
415 | if (!error) { | |
416 | BUG_ON(num_online_cpus() > 1); | |
417 | /* Make sure the CPUs won't be enabled by someone else */ | |
418 | cpu_hotplug_disabled = 1; | |
419 | } else { | |
420 | printk(KERN_ERR "Non-boot CPUs are not disabled\n"); | |
421 | } | |
422 | cpu_maps_update_done(); | |
423 | return error; | |
424 | } | |
425 | ||
426 | void __weak arch_enable_nonboot_cpus_begin(void) | |
427 | { | |
428 | } | |
429 | ||
430 | void __weak arch_enable_nonboot_cpus_end(void) | |
431 | { | |
432 | } | |
433 | ||
434 | void __ref enable_nonboot_cpus(void) | |
435 | { | |
436 | int cpu, error; | |
437 | ||
438 | /* Allow everyone to use the CPU hotplug again */ | |
439 | cpu_maps_update_begin(); | |
440 | cpu_hotplug_disabled = 0; | |
441 | if (cpumask_empty(frozen_cpus)) | |
442 | goto out; | |
443 | ||
444 | printk("Enabling non-boot CPUs ...\n"); | |
445 | ||
446 | arch_enable_nonboot_cpus_begin(); | |
447 | ||
448 | for_each_cpu(cpu, frozen_cpus) { | |
449 | error = _cpu_up(cpu, 1); | |
450 | if (!error) { | |
451 | printk("CPU%d is up\n", cpu); | |
452 | continue; | |
453 | } | |
454 | printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error); | |
455 | } | |
456 | ||
457 | arch_enable_nonboot_cpus_end(); | |
458 | ||
459 | cpumask_clear(frozen_cpus); | |
460 | out: | |
461 | cpu_maps_update_done(); | |
462 | } | |
463 | ||
464 | static int alloc_frozen_cpus(void) | |
465 | { | |
466 | if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) | |
467 | return -ENOMEM; | |
468 | return 0; | |
469 | } | |
470 | core_initcall(alloc_frozen_cpus); | |
471 | #endif /* CONFIG_PM_SLEEP_SMP */ | |
472 | ||
473 | /** | |
474 | * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers | |
475 | * @cpu: cpu that just started | |
476 | * | |
477 | * This function calls the cpu_chain notifiers with CPU_STARTING. | |
478 | * It must be called by the arch code on the new cpu, before the new cpu | |
479 | * enables interrupts and before the "boot" cpu returns from __cpu_up(). | |
480 | */ | |
481 | void __cpuinit notify_cpu_starting(unsigned int cpu) | |
482 | { | |
483 | unsigned long val = CPU_STARTING; | |
484 | ||
485 | #ifdef CONFIG_PM_SLEEP_SMP | |
486 | if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus)) | |
487 | val = CPU_STARTING_FROZEN; | |
488 | #endif /* CONFIG_PM_SLEEP_SMP */ | |
489 | cpu_notify(val, (void *)(long)cpu); | |
490 | } | |
491 | ||
492 | #endif /* CONFIG_SMP */ | |
493 | ||
494 | /* | |
495 | * cpu_bit_bitmap[] is a special, "compressed" data structure that | |
496 | * represents all NR_CPUS bits binary values of 1<<nr. | |
497 | * | |
498 | * It is used by cpumask_of() to get a constant address to a CPU | |
499 | * mask value that has a single bit set only. | |
500 | */ | |
501 | ||
502 | /* cpu_bit_bitmap[0] is empty - so we can back into it */ | |
503 | #define MASK_DECLARE_1(x) [x+1][0] = 1UL << (x) | |
504 | #define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1) | |
505 | #define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2) | |
506 | #define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4) | |
507 | ||
508 | const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = { | |
509 | ||
510 | MASK_DECLARE_8(0), MASK_DECLARE_8(8), | |
511 | MASK_DECLARE_8(16), MASK_DECLARE_8(24), | |
512 | #if BITS_PER_LONG > 32 | |
513 | MASK_DECLARE_8(32), MASK_DECLARE_8(40), | |
514 | MASK_DECLARE_8(48), MASK_DECLARE_8(56), | |
515 | #endif | |
516 | }; | |
517 | EXPORT_SYMBOL_GPL(cpu_bit_bitmap); | |
518 | ||
519 | const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; | |
520 | EXPORT_SYMBOL(cpu_all_bits); | |
521 | ||
522 | #ifdef CONFIG_INIT_ALL_POSSIBLE | |
523 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly | |
524 | = CPU_BITS_ALL; | |
525 | #else | |
526 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly; | |
527 | #endif | |
528 | const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits); | |
529 | EXPORT_SYMBOL(cpu_possible_mask); | |
530 | ||
531 | static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly; | |
532 | const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits); | |
533 | EXPORT_SYMBOL(cpu_online_mask); | |
534 | ||
535 | static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly; | |
536 | const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits); | |
537 | EXPORT_SYMBOL(cpu_present_mask); | |
538 | ||
539 | static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly; | |
540 | const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits); | |
541 | EXPORT_SYMBOL(cpu_active_mask); | |
542 | ||
543 | void set_cpu_possible(unsigned int cpu, bool possible) | |
544 | { | |
545 | if (possible) | |
546 | cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits)); | |
547 | else | |
548 | cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits)); | |
549 | } | |
550 | ||
551 | void set_cpu_present(unsigned int cpu, bool present) | |
552 | { | |
553 | if (present) | |
554 | cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits)); | |
555 | else | |
556 | cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits)); | |
557 | } | |
558 | ||
559 | void set_cpu_online(unsigned int cpu, bool online) | |
560 | { | |
561 | if (online) | |
562 | cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits)); | |
563 | else | |
564 | cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits)); | |
565 | } | |
566 | ||
567 | void set_cpu_active(unsigned int cpu, bool active) | |
568 | { | |
569 | if (active) | |
570 | cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); | |
571 | else | |
572 | cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits)); | |
573 | } | |
574 | ||
575 | void init_cpu_present(const struct cpumask *src) | |
576 | { | |
577 | cpumask_copy(to_cpumask(cpu_present_bits), src); | |
578 | } | |
579 | ||
580 | void init_cpu_possible(const struct cpumask *src) | |
581 | { | |
582 | cpumask_copy(to_cpumask(cpu_possible_bits), src); | |
583 | } | |
584 | ||
585 | void init_cpu_online(const struct cpumask *src) | |
586 | { | |
587 | cpumask_copy(to_cpumask(cpu_online_bits), src); | |
588 | } |