| 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 | |
| 18 | #ifdef CONFIG_SMP |
| 19 | /* Serializes the updates to cpu_online_mask, cpu_present_mask */ |
| 20 | static DEFINE_MUTEX(cpu_add_remove_lock); |
| 21 | |
| 22 | static __cpuinitdata RAW_NOTIFIER_HEAD(cpu_chain); |
| 23 | |
| 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 | |
| 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; |
| 37 | } cpu_hotplug; |
| 38 | |
| 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; |
| 44 | } |
| 45 | |
| 46 | #ifdef CONFIG_HOTPLUG_CPU |
| 47 | |
| 48 | void get_online_cpus(void) |
| 49 | { |
| 50 | might_sleep(); |
| 51 | if (cpu_hotplug.active_writer == current) |
| 52 | return; |
| 53 | mutex_lock(&cpu_hotplug.lock); |
| 54 | cpu_hotplug.refcount++; |
| 55 | mutex_unlock(&cpu_hotplug.lock); |
| 56 | |
| 57 | } |
| 58 | EXPORT_SYMBOL_GPL(get_online_cpus); |
| 59 | |
| 60 | void put_online_cpus(void) |
| 61 | { |
| 62 | if (cpu_hotplug.active_writer == current) |
| 63 | return; |
| 64 | mutex_lock(&cpu_hotplug.lock); |
| 65 | if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer)) |
| 66 | wake_up_process(cpu_hotplug.active_writer); |
| 67 | mutex_unlock(&cpu_hotplug.lock); |
| 68 | |
| 69 | } |
| 70 | EXPORT_SYMBOL_GPL(put_online_cpus); |
| 71 | |
| 72 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 73 | |
| 74 | /* |
| 75 | * The following two API's must be used when attempting |
| 76 | * to serialize the updates to cpu_online_mask, cpu_present_mask. |
| 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 | * |
| 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. |
| 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 |
| 107 | * get_online_cpus() not an api which is called all that often. |
| 108 | * |
| 109 | */ |
| 110 | static void cpu_hotplug_begin(void) |
| 111 | { |
| 112 | cpu_hotplug.active_writer = current; |
| 113 | |
| 114 | for (;;) { |
| 115 | mutex_lock(&cpu_hotplug.lock); |
| 116 | if (likely(!cpu_hotplug.refcount)) |
| 117 | break; |
| 118 | __set_current_state(TASK_UNINTERRUPTIBLE); |
| 119 | mutex_unlock(&cpu_hotplug.lock); |
| 120 | schedule(); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | static void cpu_hotplug_done(void) |
| 125 | { |
| 126 | cpu_hotplug.active_writer = NULL; |
| 127 | mutex_unlock(&cpu_hotplug.lock); |
| 128 | } |
| 129 | /* Need to know about CPUs going up/down? */ |
| 130 | int __ref register_cpu_notifier(struct notifier_block *nb) |
| 131 | { |
| 132 | int ret; |
| 133 | cpu_maps_update_begin(); |
| 134 | ret = raw_notifier_chain_register(&cpu_chain, nb); |
| 135 | cpu_maps_update_done(); |
| 136 | return ret; |
| 137 | } |
| 138 | |
| 139 | #ifdef CONFIG_HOTPLUG_CPU |
| 140 | |
| 141 | EXPORT_SYMBOL(register_cpu_notifier); |
| 142 | |
| 143 | void __ref unregister_cpu_notifier(struct notifier_block *nb) |
| 144 | { |
| 145 | cpu_maps_update_begin(); |
| 146 | raw_notifier_chain_unregister(&cpu_chain, nb); |
| 147 | cpu_maps_update_done(); |
| 148 | } |
| 149 | EXPORT_SYMBOL(unregister_cpu_notifier); |
| 150 | |
| 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\ |
| 161 | (state = %ld, flags = %x) \n", |
| 162 | p->comm, task_pid_nr(p), cpu, |
| 163 | p->state, p->flags); |
| 164 | } |
| 165 | write_unlock_irq(&tasklist_lock); |
| 166 | } |
| 167 | |
| 168 | struct take_cpu_down_param { |
| 169 | unsigned long mod; |
| 170 | void *hcpu; |
| 171 | }; |
| 172 | |
| 173 | /* Take this CPU down. */ |
| 174 | static int __ref take_cpu_down(void *_param) |
| 175 | { |
| 176 | struct take_cpu_down_param *param = _param; |
| 177 | int err; |
| 178 | |
| 179 | /* Ensure this CPU doesn't handle any more interrupts. */ |
| 180 | err = __cpu_disable(); |
| 181 | if (err < 0) |
| 182 | return err; |
| 183 | |
| 184 | raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod, |
| 185 | param->hcpu); |
| 186 | |
| 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; |
| 191 | } |
| 192 | |
| 193 | /* Requires cpu_add_remove_lock to be held */ |
| 194 | static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) |
| 195 | { |
| 196 | int err, nr_calls = 0; |
| 197 | cpumask_var_t old_allowed; |
| 198 | void *hcpu = (void *)(long)cpu; |
| 199 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
| 200 | struct take_cpu_down_param tcd_param = { |
| 201 | .mod = mod, |
| 202 | .hcpu = hcpu, |
| 203 | }; |
| 204 | |
| 205 | if (num_online_cpus() == 1) |
| 206 | return -EBUSY; |
| 207 | |
| 208 | if (!cpu_online(cpu)) |
| 209 | return -EINVAL; |
| 210 | |
| 211 | if (!alloc_cpumask_var(&old_allowed, GFP_KERNEL)) |
| 212 | return -ENOMEM; |
| 213 | |
| 214 | cpu_hotplug_begin(); |
| 215 | err = __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE | mod, |
| 216 | hcpu, -1, &nr_calls); |
| 217 | if (err == NOTIFY_BAD) { |
| 218 | nr_calls--; |
| 219 | __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod, |
| 220 | hcpu, nr_calls, NULL); |
| 221 | printk("%s: attempt to take down CPU %u failed\n", |
| 222 | __func__, cpu); |
| 223 | err = -EINVAL; |
| 224 | goto out_release; |
| 225 | } |
| 226 | |
| 227 | /* Ensure that we are not runnable on dying cpu */ |
| 228 | cpumask_copy(old_allowed, ¤t->cpus_allowed); |
| 229 | set_cpus_allowed_ptr(current, |
| 230 | cpumask_of(cpumask_any_but(cpu_online_mask, cpu))); |
| 231 | |
| 232 | err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); |
| 233 | if (err) { |
| 234 | /* CPU didn't die: tell everyone. Can't complain. */ |
| 235 | if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod, |
| 236 | hcpu) == NOTIFY_BAD) |
| 237 | BUG(); |
| 238 | |
| 239 | goto out_allowed; |
| 240 | } |
| 241 | BUG_ON(cpu_online(cpu)); |
| 242 | |
| 243 | /* Wait for it to sleep (leaving idle task). */ |
| 244 | while (!idle_cpu(cpu)) |
| 245 | yield(); |
| 246 | |
| 247 | /* This actually kills the CPU. */ |
| 248 | __cpu_die(cpu); |
| 249 | |
| 250 | /* CPU is completely dead: tell everyone. Too late to complain. */ |
| 251 | if (raw_notifier_call_chain(&cpu_chain, CPU_DEAD | mod, |
| 252 | hcpu) == NOTIFY_BAD) |
| 253 | BUG(); |
| 254 | |
| 255 | check_for_tasks(cpu); |
| 256 | |
| 257 | out_allowed: |
| 258 | set_cpus_allowed_ptr(current, old_allowed); |
| 259 | out_release: |
| 260 | cpu_hotplug_done(); |
| 261 | if (!err) { |
| 262 | if (raw_notifier_call_chain(&cpu_chain, CPU_POST_DEAD | mod, |
| 263 | hcpu) == NOTIFY_BAD) |
| 264 | BUG(); |
| 265 | } |
| 266 | free_cpumask_var(old_allowed); |
| 267 | return err; |
| 268 | } |
| 269 | |
| 270 | int __ref cpu_down(unsigned int cpu) |
| 271 | { |
| 272 | int err; |
| 273 | |
| 274 | err = stop_machine_create(); |
| 275 | if (err) |
| 276 | return err; |
| 277 | cpu_maps_update_begin(); |
| 278 | |
| 279 | if (cpu_hotplug_disabled) { |
| 280 | err = -EBUSY; |
| 281 | goto out; |
| 282 | } |
| 283 | |
| 284 | set_cpu_active(cpu, false); |
| 285 | |
| 286 | /* |
| 287 | * Make sure the all cpus did the reschedule and are not |
| 288 | * using stale version of the cpu_active_mask. |
| 289 | * This is not strictly necessary becuase stop_machine() |
| 290 | * that we run down the line already provides the required |
| 291 | * synchronization. But it's really a side effect and we do not |
| 292 | * want to depend on the innards of the stop_machine here. |
| 293 | */ |
| 294 | synchronize_sched(); |
| 295 | |
| 296 | err = _cpu_down(cpu, 0); |
| 297 | |
| 298 | if (cpu_online(cpu)) |
| 299 | set_cpu_active(cpu, true); |
| 300 | |
| 301 | out: |
| 302 | cpu_maps_update_done(); |
| 303 | stop_machine_destroy(); |
| 304 | return err; |
| 305 | } |
| 306 | EXPORT_SYMBOL(cpu_down); |
| 307 | #endif /*CONFIG_HOTPLUG_CPU*/ |
| 308 | |
| 309 | /* Requires cpu_add_remove_lock to be held */ |
| 310 | static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) |
| 311 | { |
| 312 | int ret, nr_calls = 0; |
| 313 | void *hcpu = (void *)(long)cpu; |
| 314 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
| 315 | |
| 316 | if (cpu_online(cpu) || !cpu_present(cpu)) |
| 317 | return -EINVAL; |
| 318 | |
| 319 | cpu_hotplug_begin(); |
| 320 | ret = __raw_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE | mod, hcpu, |
| 321 | -1, &nr_calls); |
| 322 | if (ret == NOTIFY_BAD) { |
| 323 | nr_calls--; |
| 324 | printk("%s: attempt to bring up CPU %u failed\n", |
| 325 | __func__, cpu); |
| 326 | ret = -EINVAL; |
| 327 | goto out_notify; |
| 328 | } |
| 329 | |
| 330 | /* Arch-specific enabling code. */ |
| 331 | ret = __cpu_up(cpu); |
| 332 | if (ret != 0) |
| 333 | goto out_notify; |
| 334 | BUG_ON(!cpu_online(cpu)); |
| 335 | |
| 336 | set_cpu_active(cpu, true); |
| 337 | |
| 338 | /* Now call notifier in preparation. */ |
| 339 | raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu); |
| 340 | |
| 341 | out_notify: |
| 342 | if (ret != 0) |
| 343 | __raw_notifier_call_chain(&cpu_chain, |
| 344 | CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); |
| 345 | cpu_hotplug_done(); |
| 346 | |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | int __cpuinit cpu_up(unsigned int cpu) |
| 351 | { |
| 352 | int err = 0; |
| 353 | if (!cpu_possible(cpu)) { |
| 354 | printk(KERN_ERR "can't online cpu %d because it is not " |
| 355 | "configured as may-hotadd at boot time\n", cpu); |
| 356 | #if defined(CONFIG_IA64) || defined(CONFIG_X86_64) |
| 357 | printk(KERN_ERR "please check additional_cpus= boot " |
| 358 | "parameter\n"); |
| 359 | #endif |
| 360 | return -EINVAL; |
| 361 | } |
| 362 | |
| 363 | cpu_maps_update_begin(); |
| 364 | |
| 365 | if (cpu_hotplug_disabled) { |
| 366 | err = -EBUSY; |
| 367 | goto out; |
| 368 | } |
| 369 | |
| 370 | err = _cpu_up(cpu, 0); |
| 371 | |
| 372 | out: |
| 373 | cpu_maps_update_done(); |
| 374 | return err; |
| 375 | } |
| 376 | |
| 377 | #ifdef CONFIG_PM_SLEEP_SMP |
| 378 | static cpumask_var_t frozen_cpus; |
| 379 | |
| 380 | int disable_nonboot_cpus(void) |
| 381 | { |
| 382 | int cpu, first_cpu, error; |
| 383 | |
| 384 | error = stop_machine_create(); |
| 385 | if (error) |
| 386 | return error; |
| 387 | cpu_maps_update_begin(); |
| 388 | first_cpu = cpumask_first(cpu_online_mask); |
| 389 | /* We take down all of the non-boot CPUs in one shot to avoid races |
| 390 | * with the userspace trying to use the CPU hotplug at the same time |
| 391 | */ |
| 392 | cpumask_clear(frozen_cpus); |
| 393 | printk("Disabling non-boot CPUs ...\n"); |
| 394 | for_each_online_cpu(cpu) { |
| 395 | if (cpu == first_cpu) |
| 396 | continue; |
| 397 | error = _cpu_down(cpu, 1); |
| 398 | if (!error) { |
| 399 | cpumask_set_cpu(cpu, frozen_cpus); |
| 400 | printk("CPU%d is down\n", cpu); |
| 401 | } else { |
| 402 | printk(KERN_ERR "Error taking CPU%d down: %d\n", |
| 403 | cpu, error); |
| 404 | break; |
| 405 | } |
| 406 | } |
| 407 | if (!error) { |
| 408 | BUG_ON(num_online_cpus() > 1); |
| 409 | /* Make sure the CPUs won't be enabled by someone else */ |
| 410 | cpu_hotplug_disabled = 1; |
| 411 | } else { |
| 412 | printk(KERN_ERR "Non-boot CPUs are not disabled\n"); |
| 413 | } |
| 414 | cpu_maps_update_done(); |
| 415 | stop_machine_destroy(); |
| 416 | return error; |
| 417 | } |
| 418 | |
| 419 | void __ref enable_nonboot_cpus(void) |
| 420 | { |
| 421 | int cpu, error; |
| 422 | |
| 423 | /* Allow everyone to use the CPU hotplug again */ |
| 424 | cpu_maps_update_begin(); |
| 425 | cpu_hotplug_disabled = 0; |
| 426 | if (cpumask_empty(frozen_cpus)) |
| 427 | goto out; |
| 428 | |
| 429 | printk("Enabling non-boot CPUs ...\n"); |
| 430 | for_each_cpu(cpu, frozen_cpus) { |
| 431 | error = _cpu_up(cpu, 1); |
| 432 | if (!error) { |
| 433 | printk("CPU%d is up\n", cpu); |
| 434 | continue; |
| 435 | } |
| 436 | printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error); |
| 437 | } |
| 438 | cpumask_clear(frozen_cpus); |
| 439 | out: |
| 440 | cpu_maps_update_done(); |
| 441 | } |
| 442 | |
| 443 | static int alloc_frozen_cpus(void) |
| 444 | { |
| 445 | if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) |
| 446 | return -ENOMEM; |
| 447 | return 0; |
| 448 | } |
| 449 | core_initcall(alloc_frozen_cpus); |
| 450 | #endif /* CONFIG_PM_SLEEP_SMP */ |
| 451 | |
| 452 | /** |
| 453 | * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers |
| 454 | * @cpu: cpu that just started |
| 455 | * |
| 456 | * This function calls the cpu_chain notifiers with CPU_STARTING. |
| 457 | * It must be called by the arch code on the new cpu, before the new cpu |
| 458 | * enables interrupts and before the "boot" cpu returns from __cpu_up(). |
| 459 | */ |
| 460 | void __cpuinit notify_cpu_starting(unsigned int cpu) |
| 461 | { |
| 462 | unsigned long val = CPU_STARTING; |
| 463 | |
| 464 | #ifdef CONFIG_PM_SLEEP_SMP |
| 465 | if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus)) |
| 466 | val = CPU_STARTING_FROZEN; |
| 467 | #endif /* CONFIG_PM_SLEEP_SMP */ |
| 468 | raw_notifier_call_chain(&cpu_chain, val, (void *)(long)cpu); |
| 469 | } |
| 470 | |
| 471 | #endif /* CONFIG_SMP */ |
| 472 | |
| 473 | /* |
| 474 | * cpu_bit_bitmap[] is a special, "compressed" data structure that |
| 475 | * represents all NR_CPUS bits binary values of 1<<nr. |
| 476 | * |
| 477 | * It is used by cpumask_of() to get a constant address to a CPU |
| 478 | * mask value that has a single bit set only. |
| 479 | */ |
| 480 | |
| 481 | /* cpu_bit_bitmap[0] is empty - so we can back into it */ |
| 482 | #define MASK_DECLARE_1(x) [x+1][0] = 1UL << (x) |
| 483 | #define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1) |
| 484 | #define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2) |
| 485 | #define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4) |
| 486 | |
| 487 | const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = { |
| 488 | |
| 489 | MASK_DECLARE_8(0), MASK_DECLARE_8(8), |
| 490 | MASK_DECLARE_8(16), MASK_DECLARE_8(24), |
| 491 | #if BITS_PER_LONG > 32 |
| 492 | MASK_DECLARE_8(32), MASK_DECLARE_8(40), |
| 493 | MASK_DECLARE_8(48), MASK_DECLARE_8(56), |
| 494 | #endif |
| 495 | }; |
| 496 | EXPORT_SYMBOL_GPL(cpu_bit_bitmap); |
| 497 | |
| 498 | const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; |
| 499 | EXPORT_SYMBOL(cpu_all_bits); |
| 500 | |
| 501 | #ifdef CONFIG_INIT_ALL_POSSIBLE |
| 502 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly |
| 503 | = CPU_BITS_ALL; |
| 504 | #else |
| 505 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly; |
| 506 | #endif |
| 507 | const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits); |
| 508 | EXPORT_SYMBOL(cpu_possible_mask); |
| 509 | |
| 510 | static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly; |
| 511 | const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits); |
| 512 | EXPORT_SYMBOL(cpu_online_mask); |
| 513 | |
| 514 | static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly; |
| 515 | const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits); |
| 516 | EXPORT_SYMBOL(cpu_present_mask); |
| 517 | |
| 518 | static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly; |
| 519 | const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits); |
| 520 | EXPORT_SYMBOL(cpu_active_mask); |
| 521 | |
| 522 | void set_cpu_possible(unsigned int cpu, bool possible) |
| 523 | { |
| 524 | if (possible) |
| 525 | cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits)); |
| 526 | else |
| 527 | cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits)); |
| 528 | } |
| 529 | |
| 530 | void set_cpu_present(unsigned int cpu, bool present) |
| 531 | { |
| 532 | if (present) |
| 533 | cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits)); |
| 534 | else |
| 535 | cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits)); |
| 536 | } |
| 537 | |
| 538 | void set_cpu_online(unsigned int cpu, bool online) |
| 539 | { |
| 540 | if (online) |
| 541 | cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits)); |
| 542 | else |
| 543 | cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits)); |
| 544 | } |
| 545 | |
| 546 | void set_cpu_active(unsigned int cpu, bool active) |
| 547 | { |
| 548 | if (active) |
| 549 | cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); |
| 550 | else |
| 551 | cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits)); |
| 552 | } |
| 553 | |
| 554 | void init_cpu_present(const struct cpumask *src) |
| 555 | { |
| 556 | cpumask_copy(to_cpumask(cpu_present_bits), src); |
| 557 | } |
| 558 | |
| 559 | void init_cpu_possible(const struct cpumask *src) |
| 560 | { |
| 561 | cpumask_copy(to_cpumask(cpu_possible_bits), src); |
| 562 | } |
| 563 | |
| 564 | void init_cpu_online(const struct cpumask *src) |
| 565 | { |
| 566 | cpumask_copy(to_cpumask(cpu_online_bits), src); |
| 567 | } |