diff options
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/cgroup_freezer.c | 7 | ||||
-rw-r--r-- | kernel/freezer.c | 31 | ||||
-rw-r--r-- | kernel/power/process.c | 2 |
3 files changed, 16 insertions, 24 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c index 5e828a2..a6d405a 100644 --- a/kernel/cgroup_freezer.c +++ b/kernel/cgroup_freezer.c @@ -130,7 +130,7 @@ struct cgroup_subsys freezer_subsys; * write_lock css_set_lock (cgroup iterator start) * task->alloc_lock * read_lock css_set_lock (cgroup iterator start) - * task->alloc_lock (inside thaw_process(), prevents race with refrigerator()) + * task->alloc_lock (inside __thaw_task(), prevents race with refrigerator()) * sighand->siglock */ static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss, @@ -300,9 +300,8 @@ static void unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer) struct task_struct *task; cgroup_iter_start(cgroup, &it); - while ((task = cgroup_iter_next(cgroup, &it))) { - thaw_process(task); - } + while ((task = cgroup_iter_next(cgroup, &it))) + __thaw_task(task); cgroup_iter_end(cgroup, &it); freezer->state = CGROUP_THAWED; diff --git a/kernel/freezer.c b/kernel/freezer.c index b83c30e..c851d58 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -145,18 +145,8 @@ void cancel_freezing(struct task_struct *p) } } -static int __thaw_process(struct task_struct *p) -{ - if (frozen(p)) { - p->flags &= ~PF_FROZEN; - return 1; - } - clear_freeze_flag(p); - return 0; -} - /* - * Wake up a frozen process + * Wake up a frozen task * * task_lock() is needed to prevent the race with refrigerator() which may * occur if the freezing of tasks fails. Namely, without the lock, if the @@ -164,15 +154,18 @@ static int __thaw_process(struct task_struct *p) * refrigerator() could call frozen_process(), in which case the task would be * frozen and no one would thaw it. */ -int thaw_process(struct task_struct *p) +void __thaw_task(struct task_struct *p) { + bool was_frozen; + task_lock(p); - if (__thaw_process(p) == 1) { - task_unlock(p); - wake_up_process(p); - return 1; - } + was_frozen = frozen(p); + if (was_frozen) + p->flags &= ~PF_FROZEN; + else + clear_freeze_flag(p); task_unlock(p); - return 0; + + if (was_frozen) + wake_up_process(p); } -EXPORT_SYMBOL(thaw_process); diff --git a/kernel/power/process.c b/kernel/power/process.c index addbbe5..fe27872 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -186,7 +186,7 @@ static void thaw_tasks(bool nosig_only) if (cgroup_freezing_or_frozen(p)) continue; - thaw_process(p); + __thaw_task(p); } while_each_thread(g, p); read_unlock(&tasklist_lock); } |