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Commit | Line | Data |
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1da177e4 LT |
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> | |
81615b62 | 16 | #include <linux/mutex.h> |
1da177e4 | 17 | |
98a79d6a | 18 | #ifdef CONFIG_SMP |
b3199c02 | 19 | /* Serializes the updates to cpu_online_mask, cpu_present_mask */ |
aa953877 | 20 | static DEFINE_MUTEX(cpu_add_remove_lock); |
1da177e4 | 21 | |
bd5349cf | 22 | static __cpuinitdata RAW_NOTIFIER_HEAD(cpu_chain); |
1da177e4 | 23 | |
e3920fb4 RW |
24 | /* If set, cpu_up and cpu_down will return -EBUSY and do nothing. |
25 | * Should always be manipulated under cpu_add_remove_lock | |
26 | */ | |
27 | static int cpu_hotplug_disabled; | |
28 | ||
d221938c GS |
29 | static struct { |
30 | struct task_struct *active_writer; | |
31 | struct mutex lock; /* Synchronizes accesses to refcount, */ | |
32 | /* | |
33 | * Also blocks the new readers during | |
34 | * an ongoing cpu hotplug operation. | |
35 | */ | |
36 | int refcount; | |
d221938c | 37 | } cpu_hotplug; |
90d45d17 | 38 | |
d221938c GS |
39 | void __init cpu_hotplug_init(void) |
40 | { | |
41 | cpu_hotplug.active_writer = NULL; | |
42 | mutex_init(&cpu_hotplug.lock); | |
43 | cpu_hotplug.refcount = 0; | |
d221938c GS |
44 | } |
45 | ||
46 | #ifdef CONFIG_HOTPLUG_CPU | |
90d45d17 | 47 | |
86ef5c9a | 48 | void get_online_cpus(void) |
a9d9baa1 | 49 | { |
d221938c GS |
50 | might_sleep(); |
51 | if (cpu_hotplug.active_writer == current) | |
aa953877 | 52 | return; |
d221938c GS |
53 | mutex_lock(&cpu_hotplug.lock); |
54 | cpu_hotplug.refcount++; | |
55 | mutex_unlock(&cpu_hotplug.lock); | |
56 | ||
a9d9baa1 | 57 | } |
86ef5c9a | 58 | EXPORT_SYMBOL_GPL(get_online_cpus); |
90d45d17 | 59 | |
86ef5c9a | 60 | void put_online_cpus(void) |
a9d9baa1 | 61 | { |
d221938c | 62 | if (cpu_hotplug.active_writer == current) |
aa953877 | 63 | return; |
d221938c | 64 | mutex_lock(&cpu_hotplug.lock); |
d2ba7e2a ON |
65 | if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer)) |
66 | wake_up_process(cpu_hotplug.active_writer); | |
d221938c GS |
67 | mutex_unlock(&cpu_hotplug.lock); |
68 | ||
a9d9baa1 | 69 | } |
86ef5c9a | 70 | EXPORT_SYMBOL_GPL(put_online_cpus); |
a9d9baa1 | 71 | |
a9d9baa1 | 72 | #endif /* CONFIG_HOTPLUG_CPU */ |
90d45d17 | 73 | |
d221938c GS |
74 | /* |
75 | * The following two API's must be used when attempting | |
b3199c02 | 76 | * to serialize the updates to cpu_online_mask, cpu_present_mask. |
d221938c GS |
77 | */ |
78 | void cpu_maps_update_begin(void) | |
79 | { | |
80 | mutex_lock(&cpu_add_remove_lock); | |
81 | } | |
82 | ||
83 | void cpu_maps_update_done(void) | |
84 | { | |
85 | mutex_unlock(&cpu_add_remove_lock); | |
86 | } | |
87 | ||
88 | /* | |
89 | * This ensures that the hotplug operation can begin only when the | |
90 | * refcount goes to zero. | |
91 | * | |
92 | * Note that during a cpu-hotplug operation, the new readers, if any, | |
93 | * will be blocked by the cpu_hotplug.lock | |
94 | * | |
d2ba7e2a ON |
95 | * Since cpu_hotplug_begin() is always called after invoking |
96 | * cpu_maps_update_begin(), we can be sure that only one writer is active. | |
d221938c GS |
97 | * |
98 | * Note that theoretically, there is a possibility of a livelock: | |
99 | * - Refcount goes to zero, last reader wakes up the sleeping | |
100 | * writer. | |
101 | * - Last reader unlocks the cpu_hotplug.lock. | |
102 | * - A new reader arrives at this moment, bumps up the refcount. | |
103 | * - The writer acquires the cpu_hotplug.lock finds the refcount | |
104 | * non zero and goes to sleep again. | |
105 | * | |
106 | * However, this is very difficult to achieve in practice since | |
86ef5c9a | 107 | * get_online_cpus() not an api which is called all that often. |
d221938c GS |
108 | * |
109 | */ | |
110 | static void cpu_hotplug_begin(void) | |
111 | { | |
d221938c | 112 | cpu_hotplug.active_writer = current; |
d2ba7e2a ON |
113 | |
114 | for (;;) { | |
115 | mutex_lock(&cpu_hotplug.lock); | |
116 | if (likely(!cpu_hotplug.refcount)) | |
117 | break; | |
118 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
d221938c GS |
119 | mutex_unlock(&cpu_hotplug.lock); |
120 | schedule(); | |
d221938c | 121 | } |
d221938c GS |
122 | } |
123 | ||
124 | static void cpu_hotplug_done(void) | |
125 | { | |
126 | cpu_hotplug.active_writer = NULL; | |
127 | mutex_unlock(&cpu_hotplug.lock); | |
128 | } | |
1da177e4 | 129 | /* Need to know about CPUs going up/down? */ |
f7b16c10 | 130 | int __ref register_cpu_notifier(struct notifier_block *nb) |
1da177e4 | 131 | { |
bd5349cf | 132 | int ret; |
d221938c | 133 | cpu_maps_update_begin(); |
bd5349cf | 134 | ret = raw_notifier_chain_register(&cpu_chain, nb); |
d221938c | 135 | cpu_maps_update_done(); |
bd5349cf | 136 | return ret; |
1da177e4 | 137 | } |
65edc68c CS |
138 | |
139 | #ifdef CONFIG_HOTPLUG_CPU | |
140 | ||
1da177e4 LT |
141 | EXPORT_SYMBOL(register_cpu_notifier); |
142 | ||
9647155f | 143 | void __ref unregister_cpu_notifier(struct notifier_block *nb) |
1da177e4 | 144 | { |
d221938c | 145 | cpu_maps_update_begin(); |
bd5349cf | 146 | raw_notifier_chain_unregister(&cpu_chain, nb); |
d221938c | 147 | cpu_maps_update_done(); |
1da177e4 LT |
148 | } |
149 | EXPORT_SYMBOL(unregister_cpu_notifier); | |
150 | ||
1da177e4 LT |
151 | static inline void check_for_tasks(int cpu) |
152 | { | |
153 | struct task_struct *p; | |
154 | ||
155 | write_lock_irq(&tasklist_lock); | |
156 | for_each_process(p) { | |
157 | if (task_cpu(p) == cpu && | |
158 | (!cputime_eq(p->utime, cputime_zero) || | |
159 | !cputime_eq(p->stime, cputime_zero))) | |
160 | printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d\ | |
e7407dcc | 161 | (state = %ld, flags = %x) \n", |
ba25f9dc PE |
162 | p->comm, task_pid_nr(p), cpu, |
163 | p->state, p->flags); | |
1da177e4 LT |
164 | } |
165 | write_unlock_irq(&tasklist_lock); | |
166 | } | |
167 | ||
db912f96 AK |
168 | struct take_cpu_down_param { |
169 | unsigned long mod; | |
170 | void *hcpu; | |
171 | }; | |
172 | ||
1da177e4 | 173 | /* Take this CPU down. */ |
514a20a5 | 174 | static int __ref take_cpu_down(void *_param) |
1da177e4 | 175 | { |
db912f96 | 176 | struct take_cpu_down_param *param = _param; |
1da177e4 LT |
177 | int err; |
178 | ||
1da177e4 LT |
179 | /* Ensure this CPU doesn't handle any more interrupts. */ |
180 | err = __cpu_disable(); | |
181 | if (err < 0) | |
f3705136 | 182 | return err; |
1da177e4 | 183 | |
3ba35573 MS |
184 | raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod, |
185 | param->hcpu); | |
186 | ||
f3705136 ZM |
187 | /* Force idle task to run as soon as we yield: it should |
188 | immediately notice cpu is offline and die quickly. */ | |
189 | sched_idle_next(); | |
190 | return 0; | |
1da177e4 LT |
191 | } |
192 | ||
e3920fb4 | 193 | /* Requires cpu_add_remove_lock to be held */ |
514a20a5 | 194 | static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) |
1da177e4 | 195 | { |
e7407dcc | 196 | int err, nr_calls = 0; |
1da177e4 | 197 | cpumask_t old_allowed, tmp; |
e7407dcc | 198 | void *hcpu = (void *)(long)cpu; |
8bb78442 | 199 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
db912f96 AK |
200 | struct take_cpu_down_param tcd_param = { |
201 | .mod = mod, | |
202 | .hcpu = hcpu, | |
203 | }; | |
1da177e4 | 204 | |
e3920fb4 RW |
205 | if (num_online_cpus() == 1) |
206 | return -EBUSY; | |
1da177e4 | 207 | |
e3920fb4 RW |
208 | if (!cpu_online(cpu)) |
209 | return -EINVAL; | |
1da177e4 | 210 | |
d221938c | 211 | cpu_hotplug_begin(); |
8bb78442 | 212 | err = __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE | mod, |
e7407dcc | 213 | hcpu, -1, &nr_calls); |
1da177e4 | 214 | if (err == NOTIFY_BAD) { |
a0d8cdb6 | 215 | nr_calls--; |
8bb78442 RW |
216 | __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod, |
217 | hcpu, nr_calls, NULL); | |
1da177e4 | 218 | printk("%s: attempt to take down CPU %u failed\n", |
af1f16d0 | 219 | __func__, cpu); |
baaca49f GS |
220 | err = -EINVAL; |
221 | goto out_release; | |
1da177e4 LT |
222 | } |
223 | ||
224 | /* Ensure that we are not runnable on dying cpu */ | |
225 | old_allowed = current->cpus_allowed; | |
f70316da | 226 | cpus_setall(tmp); |
1da177e4 | 227 | cpu_clear(cpu, tmp); |
f70316da | 228 | set_cpus_allowed_ptr(current, &tmp); |
eeec4fad | 229 | tmp = cpumask_of_cpu(cpu); |
1da177e4 | 230 | |
eeec4fad | 231 | err = __stop_machine(take_cpu_down, &tcd_param, &tmp); |
04321587 | 232 | if (err) { |
1da177e4 | 233 | /* CPU didn't die: tell everyone. Can't complain. */ |
8bb78442 | 234 | if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod, |
e7407dcc | 235 | hcpu) == NOTIFY_BAD) |
1da177e4 LT |
236 | BUG(); |
237 | ||
ffdb5976 | 238 | goto out_allowed; |
8fa1d7d3 | 239 | } |
04321587 | 240 | BUG_ON(cpu_online(cpu)); |
1da177e4 LT |
241 | |
242 | /* Wait for it to sleep (leaving idle task). */ | |
243 | while (!idle_cpu(cpu)) | |
244 | yield(); | |
245 | ||
246 | /* This actually kills the CPU. */ | |
247 | __cpu_die(cpu); | |
248 | ||
1da177e4 | 249 | /* CPU is completely dead: tell everyone. Too late to complain. */ |
8bb78442 RW |
250 | if (raw_notifier_call_chain(&cpu_chain, CPU_DEAD | mod, |
251 | hcpu) == NOTIFY_BAD) | |
1da177e4 LT |
252 | BUG(); |
253 | ||
254 | check_for_tasks(cpu); | |
255 | ||
1da177e4 | 256 | out_allowed: |
f70316da | 257 | set_cpus_allowed_ptr(current, &old_allowed); |
baaca49f | 258 | out_release: |
d221938c | 259 | cpu_hotplug_done(); |
3da1c84c ON |
260 | if (!err) { |
261 | if (raw_notifier_call_chain(&cpu_chain, CPU_POST_DEAD | mod, | |
262 | hcpu) == NOTIFY_BAD) | |
263 | BUG(); | |
264 | } | |
e3920fb4 RW |
265 | return err; |
266 | } | |
267 | ||
514a20a5 | 268 | int __ref cpu_down(unsigned int cpu) |
e3920fb4 RW |
269 | { |
270 | int err = 0; | |
271 | ||
d221938c | 272 | cpu_maps_update_begin(); |
e761b772 MK |
273 | |
274 | if (cpu_hotplug_disabled) { | |
e3920fb4 | 275 | err = -EBUSY; |
e761b772 MK |
276 | goto out; |
277 | } | |
278 | ||
279 | cpu_clear(cpu, cpu_active_map); | |
280 | ||
39b0fad7 MK |
281 | /* |
282 | * Make sure the all cpus did the reschedule and are not | |
283 | * using stale version of the cpu_active_map. | |
284 | * This is not strictly necessary becuase stop_machine() | |
285 | * that we run down the line already provides the required | |
286 | * synchronization. But it's really a side effect and we do not | |
287 | * want to depend on the innards of the stop_machine here. | |
288 | */ | |
289 | synchronize_sched(); | |
e3920fb4 | 290 | |
e761b772 | 291 | err = _cpu_down(cpu, 0); |
e3920fb4 | 292 | |
e761b772 MK |
293 | if (cpu_online(cpu)) |
294 | cpu_set(cpu, cpu_active_map); | |
295 | ||
296 | out: | |
d221938c | 297 | cpu_maps_update_done(); |
1da177e4 LT |
298 | return err; |
299 | } | |
b62b8ef9 | 300 | EXPORT_SYMBOL(cpu_down); |
1da177e4 LT |
301 | #endif /*CONFIG_HOTPLUG_CPU*/ |
302 | ||
e3920fb4 | 303 | /* Requires cpu_add_remove_lock to be held */ |
8bb78442 | 304 | static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) |
1da177e4 | 305 | { |
baaca49f | 306 | int ret, nr_calls = 0; |
1da177e4 | 307 | void *hcpu = (void *)(long)cpu; |
8bb78442 | 308 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
1da177e4 | 309 | |
e3920fb4 RW |
310 | if (cpu_online(cpu) || !cpu_present(cpu)) |
311 | return -EINVAL; | |
90d45d17 | 312 | |
d221938c | 313 | cpu_hotplug_begin(); |
8bb78442 | 314 | ret = __raw_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE | mod, hcpu, |
baaca49f | 315 | -1, &nr_calls); |
1da177e4 | 316 | if (ret == NOTIFY_BAD) { |
a0d8cdb6 | 317 | nr_calls--; |
1da177e4 | 318 | printk("%s: attempt to bring up CPU %u failed\n", |
af1f16d0 | 319 | __func__, cpu); |
1da177e4 LT |
320 | ret = -EINVAL; |
321 | goto out_notify; | |
322 | } | |
323 | ||
324 | /* Arch-specific enabling code. */ | |
325 | ret = __cpu_up(cpu); | |
326 | if (ret != 0) | |
327 | goto out_notify; | |
6978c705 | 328 | BUG_ON(!cpu_online(cpu)); |
1da177e4 | 329 | |
279ef6bb DA |
330 | cpu_set(cpu, cpu_active_map); |
331 | ||
1da177e4 | 332 | /* Now call notifier in preparation. */ |
8bb78442 | 333 | raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu); |
1da177e4 LT |
334 | |
335 | out_notify: | |
336 | if (ret != 0) | |
baaca49f | 337 | __raw_notifier_call_chain(&cpu_chain, |
8bb78442 | 338 | CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); |
d221938c | 339 | cpu_hotplug_done(); |
e3920fb4 RW |
340 | |
341 | return ret; | |
342 | } | |
343 | ||
b282b6f8 | 344 | int __cpuinit cpu_up(unsigned int cpu) |
e3920fb4 RW |
345 | { |
346 | int err = 0; | |
73e753a5 KH |
347 | if (!cpu_isset(cpu, cpu_possible_map)) { |
348 | printk(KERN_ERR "can't online cpu %d because it is not " | |
349 | "configured as may-hotadd at boot time\n", cpu); | |
3ee1062b | 350 | #if defined(CONFIG_IA64) || defined(CONFIG_X86_64) |
73e753a5 KH |
351 | printk(KERN_ERR "please check additional_cpus= boot " |
352 | "parameter\n"); | |
353 | #endif | |
354 | return -EINVAL; | |
355 | } | |
e3920fb4 | 356 | |
d221938c | 357 | cpu_maps_update_begin(); |
e761b772 MK |
358 | |
359 | if (cpu_hotplug_disabled) { | |
e3920fb4 | 360 | err = -EBUSY; |
e761b772 MK |
361 | goto out; |
362 | } | |
363 | ||
364 | err = _cpu_up(cpu, 0); | |
365 | ||
e761b772 | 366 | out: |
d221938c | 367 | cpu_maps_update_done(); |
e3920fb4 RW |
368 | return err; |
369 | } | |
370 | ||
f3de4be9 | 371 | #ifdef CONFIG_PM_SLEEP_SMP |
e3920fb4 RW |
372 | static cpumask_t frozen_cpus; |
373 | ||
374 | int disable_nonboot_cpus(void) | |
375 | { | |
e1d9fd2e | 376 | int cpu, first_cpu, error = 0; |
e3920fb4 | 377 | |
d221938c | 378 | cpu_maps_update_begin(); |
1d64b9cb | 379 | first_cpu = first_cpu(cpu_online_map); |
e3920fb4 RW |
380 | /* We take down all of the non-boot CPUs in one shot to avoid races |
381 | * with the userspace trying to use the CPU hotplug at the same time | |
382 | */ | |
383 | cpus_clear(frozen_cpus); | |
384 | printk("Disabling non-boot CPUs ...\n"); | |
385 | for_each_online_cpu(cpu) { | |
386 | if (cpu == first_cpu) | |
387 | continue; | |
8bb78442 | 388 | error = _cpu_down(cpu, 1); |
e3920fb4 RW |
389 | if (!error) { |
390 | cpu_set(cpu, frozen_cpus); | |
391 | printk("CPU%d is down\n", cpu); | |
392 | } else { | |
393 | printk(KERN_ERR "Error taking CPU%d down: %d\n", | |
394 | cpu, error); | |
395 | break; | |
396 | } | |
397 | } | |
398 | if (!error) { | |
399 | BUG_ON(num_online_cpus() > 1); | |
400 | /* Make sure the CPUs won't be enabled by someone else */ | |
401 | cpu_hotplug_disabled = 1; | |
402 | } else { | |
e1d9fd2e | 403 | printk(KERN_ERR "Non-boot CPUs are not disabled\n"); |
e3920fb4 | 404 | } |
d221938c | 405 | cpu_maps_update_done(); |
e3920fb4 RW |
406 | return error; |
407 | } | |
408 | ||
fa7303e2 | 409 | void __ref enable_nonboot_cpus(void) |
e3920fb4 RW |
410 | { |
411 | int cpu, error; | |
412 | ||
413 | /* Allow everyone to use the CPU hotplug again */ | |
d221938c | 414 | cpu_maps_update_begin(); |
e3920fb4 | 415 | cpu_hotplug_disabled = 0; |
ed746e3b | 416 | if (cpus_empty(frozen_cpus)) |
1d64b9cb | 417 | goto out; |
e3920fb4 RW |
418 | |
419 | printk("Enabling non-boot CPUs ...\n"); | |
363ab6f1 | 420 | for_each_cpu_mask_nr(cpu, frozen_cpus) { |
8bb78442 | 421 | error = _cpu_up(cpu, 1); |
e3920fb4 RW |
422 | if (!error) { |
423 | printk("CPU%d is up\n", cpu); | |
424 | continue; | |
425 | } | |
1d64b9cb | 426 | printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error); |
e3920fb4 RW |
427 | } |
428 | cpus_clear(frozen_cpus); | |
1d64b9cb | 429 | out: |
d221938c | 430 | cpu_maps_update_done(); |
1da177e4 | 431 | } |
f3de4be9 | 432 | #endif /* CONFIG_PM_SLEEP_SMP */ |
68f4f1ec | 433 | |
e545a614 MS |
434 | /** |
435 | * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers | |
436 | * @cpu: cpu that just started | |
437 | * | |
438 | * This function calls the cpu_chain notifiers with CPU_STARTING. | |
439 | * It must be called by the arch code on the new cpu, before the new cpu | |
440 | * enables interrupts and before the "boot" cpu returns from __cpu_up(). | |
441 | */ | |
84196414 | 442 | void __cpuinit notify_cpu_starting(unsigned int cpu) |
e545a614 MS |
443 | { |
444 | unsigned long val = CPU_STARTING; | |
445 | ||
446 | #ifdef CONFIG_PM_SLEEP_SMP | |
447 | if (cpu_isset(cpu, frozen_cpus)) | |
448 | val = CPU_STARTING_FROZEN; | |
449 | #endif /* CONFIG_PM_SLEEP_SMP */ | |
450 | raw_notifier_call_chain(&cpu_chain, val, (void *)(long)cpu); | |
451 | } | |
452 | ||
68f4f1ec | 453 | #endif /* CONFIG_SMP */ |
b8d317d1 | 454 | |
e56b3bc7 LT |
455 | /* |
456 | * cpu_bit_bitmap[] is a special, "compressed" data structure that | |
457 | * represents all NR_CPUS bits binary values of 1<<nr. | |
458 | * | |
459 | * It is used by cpumask_of_cpu() to get a constant address to a CPU | |
460 | * mask value that has a single bit set only. | |
461 | */ | |
b8d317d1 | 462 | |
e56b3bc7 LT |
463 | /* cpu_bit_bitmap[0] is empty - so we can back into it */ |
464 | #define MASK_DECLARE_1(x) [x+1][0] = 1UL << (x) | |
465 | #define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1) | |
466 | #define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2) | |
467 | #define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4) | |
b8d317d1 | 468 | |
e56b3bc7 LT |
469 | const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = { |
470 | ||
471 | MASK_DECLARE_8(0), MASK_DECLARE_8(8), | |
472 | MASK_DECLARE_8(16), MASK_DECLARE_8(24), | |
473 | #if BITS_PER_LONG > 32 | |
474 | MASK_DECLARE_8(32), MASK_DECLARE_8(40), | |
475 | MASK_DECLARE_8(48), MASK_DECLARE_8(56), | |
b8d317d1 MT |
476 | #endif |
477 | }; | |
e56b3bc7 | 478 | EXPORT_SYMBOL_GPL(cpu_bit_bitmap); |
2d3854a3 RR |
479 | |
480 | const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; | |
481 | EXPORT_SYMBOL(cpu_all_bits); | |
b3199c02 RR |
482 | |
483 | #ifdef CONFIG_INIT_ALL_POSSIBLE | |
484 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly | |
485 | = CPU_BITS_ALL; | |
486 | #else | |
487 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly; | |
488 | #endif | |
489 | const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits); | |
490 | EXPORT_SYMBOL(cpu_possible_mask); | |
491 | ||
492 | static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly; | |
493 | const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits); | |
494 | EXPORT_SYMBOL(cpu_online_mask); | |
495 | ||
496 | static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly; | |
497 | const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits); | |
498 | EXPORT_SYMBOL(cpu_present_mask); | |
499 | ||
500 | static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly; | |
501 | const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits); | |
502 | EXPORT_SYMBOL(cpu_active_mask); |