From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- kernel/cpu.c | 825 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 825 insertions(+) create mode 100644 kernel/cpu.c (limited to 'kernel/cpu.c') diff --git a/kernel/cpu.c b/kernel/cpu.c new file mode 100644 index 000000000..94bbe4695 --- /dev/null +++ b/kernel/cpu.c @@ -0,0 +1,825 @@ +/* CPU control. + * (C) 2001, 2002, 2003, 2004 Rusty Russell + * + * This code is licenced under the GPL. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "smpboot.h" + +#ifdef CONFIG_SMP +/* Serializes the updates to cpu_online_mask, cpu_present_mask */ +static DEFINE_MUTEX(cpu_add_remove_lock); + +/* + * The following two APIs (cpu_maps_update_begin/done) must be used when + * attempting to serialize the updates to cpu_online_mask & cpu_present_mask. + * The APIs cpu_notifier_register_begin/done() must be used to protect CPU + * hotplug callback (un)registration performed using __register_cpu_notifier() + * or __unregister_cpu_notifier(). + */ +void cpu_maps_update_begin(void) +{ + mutex_lock(&cpu_add_remove_lock); +} +EXPORT_SYMBOL(cpu_notifier_register_begin); + +void cpu_maps_update_done(void) +{ + mutex_unlock(&cpu_add_remove_lock); +} +EXPORT_SYMBOL(cpu_notifier_register_done); + +static RAW_NOTIFIER_HEAD(cpu_chain); + +/* If set, cpu_up and cpu_down will return -EBUSY and do nothing. + * Should always be manipulated under cpu_add_remove_lock + */ +static int cpu_hotplug_disabled; + +#ifdef CONFIG_HOTPLUG_CPU + +static struct { + struct task_struct *active_writer; + /* wait queue to wake up the active_writer */ + wait_queue_head_t wq; + /* verifies that no writer will get active while readers are active */ + struct mutex lock; + /* + * Also blocks the new readers during + * an ongoing cpu hotplug operation. + */ + atomic_t refcount; + +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} cpu_hotplug = { + .active_writer = NULL, + .wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq), + .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), +#ifdef CONFIG_DEBUG_LOCK_ALLOC + .dep_map = {.name = "cpu_hotplug.lock" }, +#endif +}; + +/* Lockdep annotations for get/put_online_cpus() and cpu_hotplug_begin/end() */ +#define cpuhp_lock_acquire_read() lock_map_acquire_read(&cpu_hotplug.dep_map) +#define cpuhp_lock_acquire_tryread() \ + lock_map_acquire_tryread(&cpu_hotplug.dep_map) +#define cpuhp_lock_acquire() lock_map_acquire(&cpu_hotplug.dep_map) +#define cpuhp_lock_release() lock_map_release(&cpu_hotplug.dep_map) + + +void get_online_cpus(void) +{ + might_sleep(); + if (cpu_hotplug.active_writer == current) + return; + cpuhp_lock_acquire_read(); + mutex_lock(&cpu_hotplug.lock); + atomic_inc(&cpu_hotplug.refcount); + mutex_unlock(&cpu_hotplug.lock); +} +EXPORT_SYMBOL_GPL(get_online_cpus); + +bool try_get_online_cpus(void) +{ + if (cpu_hotplug.active_writer == current) + return true; + if (!mutex_trylock(&cpu_hotplug.lock)) + return false; + cpuhp_lock_acquire_tryread(); + atomic_inc(&cpu_hotplug.refcount); + mutex_unlock(&cpu_hotplug.lock); + return true; +} +EXPORT_SYMBOL_GPL(try_get_online_cpus); + +void put_online_cpus(void) +{ + int refcount; + + if (cpu_hotplug.active_writer == current) + return; + + refcount = atomic_dec_return(&cpu_hotplug.refcount); + if (WARN_ON(refcount < 0)) /* try to fix things up */ + atomic_inc(&cpu_hotplug.refcount); + + if (refcount <= 0 && waitqueue_active(&cpu_hotplug.wq)) + wake_up(&cpu_hotplug.wq); + + cpuhp_lock_release(); + +} +EXPORT_SYMBOL_GPL(put_online_cpus); + +/* + * This ensures that the hotplug operation can begin only when the + * refcount goes to zero. + * + * Note that during a cpu-hotplug operation, the new readers, if any, + * will be blocked by the cpu_hotplug.lock + * + * Since cpu_hotplug_begin() is always called after invoking + * cpu_maps_update_begin(), we can be sure that only one writer is active. + * + * Note that theoretically, there is a possibility of a livelock: + * - Refcount goes to zero, last reader wakes up the sleeping + * writer. + * - Last reader unlocks the cpu_hotplug.lock. + * - A new reader arrives at this moment, bumps up the refcount. + * - The writer acquires the cpu_hotplug.lock finds the refcount + * non zero and goes to sleep again. + * + * However, this is very difficult to achieve in practice since + * get_online_cpus() not an api which is called all that often. + * + */ +void cpu_hotplug_begin(void) +{ + DEFINE_WAIT(wait); + + cpu_hotplug.active_writer = current; + cpuhp_lock_acquire(); + + for (;;) { + mutex_lock(&cpu_hotplug.lock); + prepare_to_wait(&cpu_hotplug.wq, &wait, TASK_UNINTERRUPTIBLE); + if (likely(!atomic_read(&cpu_hotplug.refcount))) + break; + mutex_unlock(&cpu_hotplug.lock); + schedule(); + } + finish_wait(&cpu_hotplug.wq, &wait); +} + +void cpu_hotplug_done(void) +{ + cpu_hotplug.active_writer = NULL; + mutex_unlock(&cpu_hotplug.lock); + cpuhp_lock_release(); +} + +/* + * Wait for currently running CPU hotplug operations to complete (if any) and + * disable future CPU hotplug (from sysfs). The 'cpu_add_remove_lock' protects + * the 'cpu_hotplug_disabled' flag. The same lock is also acquired by the + * hotplug path before performing hotplug operations. So acquiring that lock + * guarantees mutual exclusion from any currently running hotplug operations. + */ +void cpu_hotplug_disable(void) +{ + cpu_maps_update_begin(); + cpu_hotplug_disabled = 1; + cpu_maps_update_done(); +} + +void cpu_hotplug_enable(void) +{ + cpu_maps_update_begin(); + cpu_hotplug_disabled = 0; + cpu_maps_update_done(); +} + +#endif /* CONFIG_HOTPLUG_CPU */ + +/* Need to know about CPUs going up/down? */ +int __ref register_cpu_notifier(struct notifier_block *nb) +{ + int ret; + cpu_maps_update_begin(); + ret = raw_notifier_chain_register(&cpu_chain, nb); + cpu_maps_update_done(); + return ret; +} + +int __ref __register_cpu_notifier(struct notifier_block *nb) +{ + return raw_notifier_chain_register(&cpu_chain, nb); +} + +static int __cpu_notify(unsigned long val, void *v, int nr_to_call, + int *nr_calls) +{ + int ret; + + ret = __raw_notifier_call_chain(&cpu_chain, val, v, nr_to_call, + nr_calls); + + return notifier_to_errno(ret); +} + +static int cpu_notify(unsigned long val, void *v) +{ + return __cpu_notify(val, v, -1, NULL); +} + +#ifdef CONFIG_HOTPLUG_CPU + +static void cpu_notify_nofail(unsigned long val, void *v) +{ + BUG_ON(cpu_notify(val, v)); +} +EXPORT_SYMBOL(register_cpu_notifier); +EXPORT_SYMBOL(__register_cpu_notifier); + +void __ref unregister_cpu_notifier(struct notifier_block *nb) +{ + cpu_maps_update_begin(); + raw_notifier_chain_unregister(&cpu_chain, nb); + cpu_maps_update_done(); +} +EXPORT_SYMBOL(unregister_cpu_notifier); + +void __ref __unregister_cpu_notifier(struct notifier_block *nb) +{ + raw_notifier_chain_unregister(&cpu_chain, nb); +} +EXPORT_SYMBOL(__unregister_cpu_notifier); + +/** + * clear_tasks_mm_cpumask - Safely clear tasks' mm_cpumask for a CPU + * @cpu: a CPU id + * + * This function walks all processes, finds a valid mm struct for each one and + * then clears a corresponding bit in mm's cpumask. While this all sounds + * trivial, there are various non-obvious corner cases, which this function + * tries to solve in a safe manner. + * + * Also note that the function uses a somewhat relaxed locking scheme, so it may + * be called only for an already offlined CPU. + */ +void clear_tasks_mm_cpumask(int cpu) +{ + struct task_struct *p; + + /* + * This function is called after the cpu is taken down and marked + * offline, so its not like new tasks will ever get this cpu set in + * their mm mask. -- Peter Zijlstra + * Thus, we may use rcu_read_lock() here, instead of grabbing + * full-fledged tasklist_lock. + */ + WARN_ON(cpu_online(cpu)); + rcu_read_lock(); + for_each_process(p) { + struct task_struct *t; + + /* + * Main thread might exit, but other threads may still have + * a valid mm. Find one. + */ + t = find_lock_task_mm(p); + if (!t) + continue; + cpumask_clear_cpu(cpu, mm_cpumask(t->mm)); + task_unlock(t); + } + rcu_read_unlock(); +} + +static inline void check_for_tasks(int dead_cpu) +{ + struct task_struct *g, *p; + + read_lock_irq(&tasklist_lock); + do_each_thread(g, p) { + if (!p->on_rq) + continue; + /* + * We do the check with unlocked task_rq(p)->lock. + * Order the reading to do not warn about a task, + * which was running on this cpu in the past, and + * it's just been woken on another cpu. + */ + rmb(); + if (task_cpu(p) != dead_cpu) + continue; + + pr_warn("Task %s (pid=%d) is on cpu %d (state=%ld, flags=%x)\n", + p->comm, task_pid_nr(p), dead_cpu, p->state, p->flags); + } while_each_thread(g, p); + read_unlock_irq(&tasklist_lock); +} + +struct take_cpu_down_param { + unsigned long mod; + void *hcpu; +}; + +/* Take this CPU down. */ +static int __ref take_cpu_down(void *_param) +{ + struct take_cpu_down_param *param = _param; + int err; + + /* Ensure this CPU doesn't handle any more interrupts. */ + err = __cpu_disable(); + if (err < 0) + return err; + + cpu_notify(CPU_DYING | param->mod, param->hcpu); + /* Give up timekeeping duties */ + tick_handover_do_timer(); + /* Park the stopper thread */ + kthread_park(current); + return 0; +} + +/* Requires cpu_add_remove_lock to be held */ +static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) +{ + int err, nr_calls = 0; + void *hcpu = (void *)(long)cpu; + unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; + struct take_cpu_down_param tcd_param = { + .mod = mod, + .hcpu = hcpu, + }; + + if (num_online_cpus() == 1) + return -EBUSY; + + if (!cpu_online(cpu)) + return -EINVAL; + + cpu_hotplug_begin(); + + err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls); + if (err) { + nr_calls--; + __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); + pr_warn("%s: attempt to take down CPU %u failed\n", + __func__, cpu); + goto out_release; + } + + /* + * By now we've cleared cpu_active_mask, wait for all preempt-disabled + * and RCU users of this state to go away such that all new such users + * will observe it. + * + * For CONFIG_PREEMPT we have preemptible RCU and its sync_rcu() might + * not imply sync_sched(), so explicitly call both. + * + * Do sync before park smpboot threads to take care the rcu boost case. + */ +#ifdef CONFIG_PREEMPT + synchronize_sched(); +#endif + synchronize_rcu(); + + smpboot_park_threads(cpu); + + /* + * So now all preempt/rcu users must observe !cpu_active(). + */ + + err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); + if (err) { + /* CPU didn't die: tell everyone. Can't complain. */ + smpboot_unpark_threads(cpu); + cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu); + goto out_release; + } + BUG_ON(cpu_online(cpu)); + + /* + * The migration_call() CPU_DYING callback will have removed all + * runnable tasks from the cpu, there's only the idle task left now + * that the migration thread is done doing the stop_machine thing. + * + * Wait for the stop thread to go away. + */ + while (!per_cpu(cpu_dead_idle, cpu)) + cpu_relax(); + smp_mb(); /* Read from cpu_dead_idle before __cpu_die(). */ + per_cpu(cpu_dead_idle, cpu) = false; + + hotplug_cpu__broadcast_tick_pull(cpu); + /* This actually kills the CPU. */ + __cpu_die(cpu); + + /* CPU is completely dead: tell everyone. Too late to complain. */ + tick_cleanup_dead_cpu(cpu); + cpu_notify_nofail(CPU_DEAD | mod, hcpu); + + check_for_tasks(cpu); + +out_release: + cpu_hotplug_done(); + if (!err) + cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); + return err; +} + +int __ref cpu_down(unsigned int cpu) +{ + int err; + + cpu_maps_update_begin(); + + if (cpu_hotplug_disabled) { + err = -EBUSY; + goto out; + } + + err = _cpu_down(cpu, 0); + +out: + cpu_maps_update_done(); + return err; +} +EXPORT_SYMBOL(cpu_down); +#endif /*CONFIG_HOTPLUG_CPU*/ + +/* + * Unpark per-CPU smpboot kthreads at CPU-online time. + */ +static int smpboot_thread_call(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + int cpu = (long)hcpu; + + switch (action & ~CPU_TASKS_FROZEN) { + + case CPU_ONLINE: + smpboot_unpark_threads(cpu); + break; + + default: + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block smpboot_thread_notifier = { + .notifier_call = smpboot_thread_call, + .priority = CPU_PRI_SMPBOOT, +}; + +void __cpuinit smpboot_thread_init(void) +{ + register_cpu_notifier(&smpboot_thread_notifier); +} + +/* Requires cpu_add_remove_lock to be held */ +static int _cpu_up(unsigned int cpu, int tasks_frozen) +{ + int ret, nr_calls = 0; + void *hcpu = (void *)(long)cpu; + unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; + struct task_struct *idle; + + cpu_hotplug_begin(); + + if (cpu_online(cpu) || !cpu_present(cpu)) { + ret = -EINVAL; + goto out; + } + + idle = idle_thread_get(cpu); + if (IS_ERR(idle)) { + ret = PTR_ERR(idle); + goto out; + } + + ret = smpboot_create_threads(cpu); + if (ret) + goto out; + + ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls); + if (ret) { + nr_calls--; + pr_warn("%s: attempt to bring up CPU %u failed\n", + __func__, cpu); + goto out_notify; + } + + /* Arch-specific enabling code. */ + ret = __cpu_up(cpu, idle); + if (ret != 0) + goto out_notify; + BUG_ON(!cpu_online(cpu)); + + /* Now call notifier in preparation. */ + cpu_notify(CPU_ONLINE | mod, hcpu); + +out_notify: + if (ret != 0) + __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); +out: + cpu_hotplug_done(); + + return ret; +} + +int cpu_up(unsigned int cpu) +{ + int err = 0; + + if (!cpu_possible(cpu)) { + pr_err("can't online cpu %d because it is not configured as may-hotadd at boot time\n", + cpu); +#if defined(CONFIG_IA64) + pr_err("please check additional_cpus= boot parameter\n"); +#endif + return -EINVAL; + } + + err = try_online_node(cpu_to_node(cpu)); + if (err) + return err; + + cpu_maps_update_begin(); + + if (cpu_hotplug_disabled) { + err = -EBUSY; + goto out; + } + + err = _cpu_up(cpu, 0); + +out: + cpu_maps_update_done(); + return err; +} +EXPORT_SYMBOL_GPL(cpu_up); + +#ifdef CONFIG_PM_SLEEP_SMP +static cpumask_var_t frozen_cpus; + +int disable_nonboot_cpus(void) +{ + int cpu, first_cpu, error = 0; + + cpu_maps_update_begin(); + first_cpu = cpumask_first(cpu_online_mask); + /* + * We take down all of the non-boot CPUs in one shot to avoid races + * with the userspace trying to use the CPU hotplug at the same time + */ + cpumask_clear(frozen_cpus); + + pr_info("Disabling non-boot CPUs ...\n"); + for_each_online_cpu(cpu) { + if (cpu == first_cpu) + continue; + trace_suspend_resume(TPS("CPU_OFF"), cpu, true); + error = _cpu_down(cpu, 1); + trace_suspend_resume(TPS("CPU_OFF"), cpu, false); + if (!error) + cpumask_set_cpu(cpu, frozen_cpus); + else { + pr_err("Error taking CPU%d down: %d\n", cpu, error); + break; + } + } + + if (!error) { + BUG_ON(num_online_cpus() > 1); + /* Make sure the CPUs won't be enabled by someone else */ + cpu_hotplug_disabled = 1; + } else { + pr_err("Non-boot CPUs are not disabled\n"); + } + cpu_maps_update_done(); + return error; +} + +void __weak arch_enable_nonboot_cpus_begin(void) +{ +} + +void __weak arch_enable_nonboot_cpus_end(void) +{ +} + +void __ref enable_nonboot_cpus(void) +{ + int cpu, error; + + /* Allow everyone to use the CPU hotplug again */ + cpu_maps_update_begin(); + cpu_hotplug_disabled = 0; + if (cpumask_empty(frozen_cpus)) + goto out; + + pr_info("Enabling non-boot CPUs ...\n"); + + arch_enable_nonboot_cpus_begin(); + + for_each_cpu(cpu, frozen_cpus) { + trace_suspend_resume(TPS("CPU_ON"), cpu, true); + error = _cpu_up(cpu, 1); + trace_suspend_resume(TPS("CPU_ON"), cpu, false); + if (!error) { + pr_info("CPU%d is up\n", cpu); + continue; + } + pr_warn("Error taking CPU%d up: %d\n", cpu, error); + } + + arch_enable_nonboot_cpus_end(); + + cpumask_clear(frozen_cpus); +out: + cpu_maps_update_done(); +} + +static int __init alloc_frozen_cpus(void) +{ + if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) + return -ENOMEM; + return 0; +} +core_initcall(alloc_frozen_cpus); + +/* + * When callbacks for CPU hotplug notifications are being executed, we must + * ensure that the state of the system with respect to the tasks being frozen + * or not, as reported by the notification, remains unchanged *throughout the + * duration* of the execution of the callbacks. + * Hence we need to prevent the freezer from racing with regular CPU hotplug. + * + * This synchronization is implemented by mutually excluding regular CPU + * hotplug and Suspend/Hibernate call paths by hooking onto the Suspend/ + * Hibernate notifications. + */ +static int +cpu_hotplug_pm_callback(struct notifier_block *nb, + unsigned long action, void *ptr) +{ + switch (action) { + + case PM_SUSPEND_PREPARE: + case PM_HIBERNATION_PREPARE: + cpu_hotplug_disable(); + break; + + case PM_POST_SUSPEND: + case PM_POST_HIBERNATION: + cpu_hotplug_enable(); + break; + + default: + return NOTIFY_DONE; + } + + return NOTIFY_OK; +} + + +static int __init cpu_hotplug_pm_sync_init(void) +{ + /* + * cpu_hotplug_pm_callback has higher priority than x86 + * bsp_pm_callback which depends on cpu_hotplug_pm_callback + * to disable cpu hotplug to avoid cpu hotplug race. + */ + pm_notifier(cpu_hotplug_pm_callback, 0); + return 0; +} +core_initcall(cpu_hotplug_pm_sync_init); + +#endif /* CONFIG_PM_SLEEP_SMP */ + +/** + * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers + * @cpu: cpu that just started + * + * This function calls the cpu_chain notifiers with CPU_STARTING. + * It must be called by the arch code on the new cpu, before the new cpu + * enables interrupts and before the "boot" cpu returns from __cpu_up(). + */ +void notify_cpu_starting(unsigned int cpu) +{ + unsigned long val = CPU_STARTING; + +#ifdef CONFIG_PM_SLEEP_SMP + if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus)) + val = CPU_STARTING_FROZEN; +#endif /* CONFIG_PM_SLEEP_SMP */ + cpu_notify(val, (void *)(long)cpu); +} + +#endif /* CONFIG_SMP */ + +/* + * cpu_bit_bitmap[] is a special, "compressed" data structure that + * represents all NR_CPUS bits binary values of 1< 32 + MASK_DECLARE_8(32), MASK_DECLARE_8(40), + MASK_DECLARE_8(48), MASK_DECLARE_8(56), +#endif +}; +EXPORT_SYMBOL_GPL(cpu_bit_bitmap); + +const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; +EXPORT_SYMBOL(cpu_all_bits); + +#ifdef CONFIG_INIT_ALL_POSSIBLE +static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly + = CPU_BITS_ALL; +#else +static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly; +#endif +const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits); +EXPORT_SYMBOL(cpu_possible_mask); + +static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly; +const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits); +EXPORT_SYMBOL(cpu_online_mask); + +static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly; +const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits); +EXPORT_SYMBOL(cpu_present_mask); + +static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly; +const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits); +EXPORT_SYMBOL(cpu_active_mask); + +void set_cpu_possible(unsigned int cpu, bool possible) +{ + if (possible) + cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits)); + else + cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits)); +} + +void set_cpu_present(unsigned int cpu, bool present) +{ + if (present) + cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits)); + else + cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits)); +} + +void set_cpu_online(unsigned int cpu, bool online) +{ + if (online) { + cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits)); + cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); + } else { + cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits)); + } +} + +void set_cpu_active(unsigned int cpu, bool active) +{ + if (active) + cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); + else + cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits)); +} + +void init_cpu_present(const struct cpumask *src) +{ + cpumask_copy(to_cpumask(cpu_present_bits), src); +} + +void init_cpu_possible(const struct cpumask *src) +{ + cpumask_copy(to_cpumask(cpu_possible_bits), src); +} + +void init_cpu_online(const struct cpumask *src) +{ + cpumask_copy(to_cpumask(cpu_online_bits), src); +} -- cgit v1.2.3-54-g00ecf