diff options
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 85ff5e26e23b..9ced7c751648 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -24,6 +24,8 @@ #include <linux/irq.h> #include <trace/events/power.h> +#include <trace/events/sched.h> + #include "smpboot.h" #ifdef CONFIG_SMP @@ -425,6 +427,7 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen) out_release: cpu_hotplug_done(); + trace_sched_cpu_hotplug(cpu, err, 0); if (!err) cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); return err; @@ -530,6 +533,7 @@ out_notify: __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); out: cpu_hotplug_done(); + trace_sched_cpu_hotplug(cpu, ret, 1); return ret; } @@ -623,6 +627,7 @@ void __weak arch_enable_nonboot_cpus_end(void) void enable_nonboot_cpus(void) { int cpu, error; + struct device *cpu_device; /* Allow everyone to use the CPU hotplug again */ cpu_maps_update_begin(); @@ -640,6 +645,12 @@ void enable_nonboot_cpus(void) trace_suspend_resume(TPS("CPU_ON"), cpu, false); if (!error) { pr_info("CPU%d is up\n", cpu); + cpu_device = get_cpu_device(cpu); + if (!cpu_device) + pr_err("%s: failed to get cpu%d device\n", + __func__, cpu); + else + kobject_uevent(&cpu_device->kobj, KOBJ_ONLINE); continue; } pr_warn("Error taking CPU%d up: %d\n", cpu, error); @@ -827,3 +838,23 @@ void init_cpu_online(const struct cpumask *src) { cpumask_copy(to_cpumask(cpu_online_bits), src); } + +static ATOMIC_NOTIFIER_HEAD(idle_notifier); + +void idle_notifier_register(struct notifier_block *n) +{ + atomic_notifier_chain_register(&idle_notifier, n); +} +EXPORT_SYMBOL_GPL(idle_notifier_register); + +void idle_notifier_unregister(struct notifier_block *n) +{ + atomic_notifier_chain_unregister(&idle_notifier, n); +} +EXPORT_SYMBOL_GPL(idle_notifier_unregister); + +void idle_notifier_call_chain(unsigned long val) +{ + atomic_notifier_call_chain(&idle_notifier, val, NULL); +} +EXPORT_SYMBOL_GPL(idle_notifier_call_chain); |