diff options
| -rw-r--r-- | include/linux/lglock.h | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/include/linux/lglock.h b/include/linux/lglock.h index 52b289f02feb..cdfcef312c79 100644 --- a/include/linux/lglock.h +++ b/include/linux/lglock.h @@ -203,9 +203,31 @@ #else /* !PREEMPT_RT_FULL */ #define DEFINE_LGLOCK(name) \ \ - DEFINE_PER_CPU(struct rt_mutex, name##_lock); \ + DEFINE_PER_CPU(struct rt_mutex, name##_lock); \ + DEFINE_SPINLOCK(name##_cpu_lock); \ + cpumask_t name##_cpus __read_mostly; \ DEFINE_LGLOCK_LOCKDEP(name); \ \ + static int \ + name##_lg_cpu_callback(struct notifier_block *nb, \ + unsigned long action, void *hcpu) \ + { \ + switch (action & ~CPU_TASKS_FROZEN) { \ + case CPU_UP_PREPARE: \ + spin_lock(&name##_cpu_lock); \ + cpu_set((unsigned long)hcpu, name##_cpus); \ + spin_unlock(&name##_cpu_lock); \ + break; \ + case CPU_UP_CANCELED: case CPU_DEAD: \ + spin_lock(&name##_cpu_lock); \ + cpu_clear((unsigned long)hcpu, name##_cpus); \ + spin_unlock(&name##_cpu_lock); \ + } \ + return NOTIFY_OK; \ + } \ + static struct notifier_block name##_lg_cpu_notifier = { \ + .notifier_call = name##_lg_cpu_callback, \ + }; \ void name##_lock_init(void) { \ int i; \ LOCKDEP_INIT_MAP(&name##_lock_dep_map, #name, &name##_lock_key, 0); \ @@ -214,6 +236,11 @@ lock = &per_cpu(name##_lock, i); \ rt_mutex_init(lock); \ } \ + register_hotcpu_notifier(&name##_lg_cpu_notifier); \ + get_online_cpus(); \ + for_each_online_cpu(i) \ + cpu_set(i, name##_cpus); \ + put_online_cpus(); \ } \ EXPORT_SYMBOL(name##_lock_init); \ \ @@ -254,7 +281,8 @@ void name##_global_lock_online(void) { \ int i; \ rwlock_acquire(&name##_lock_dep_map, 0, 0, _RET_IP_); \ - for_each_online_cpu(i) { \ + spin_lock(&name##_cpu_lock); \ + for_each_cpu(i, &name##_cpus) { \ struct rt_mutex *lock; \ lock = &per_cpu(name##_lock, i); \ __rt_spin_lock(lock); \ @@ -265,11 +293,12 @@ void name##_global_unlock_online(void) { \ int i; \ rwlock_release(&name##_lock_dep_map, 1, _RET_IP_); \ - for_each_online_cpu(i) { \ + for_each_cpu(i, &name##_cpus) { \ struct rt_mutex *lock; \ lock = &per_cpu(name##_lock, i); \ __rt_spin_unlock(lock); \ } \ + spin_unlock(&name##_cpu_lock); \ } \ EXPORT_SYMBOL(name##_global_unlock_online); \ \ |