9  * task_work_add - ask the @task to execute @work->func()
10  * @task: the task which should run the callback
12  * @notify: how to notify the targeted task
14  * Queue @work for task_work_run() below and notify the @task if @notify
18  * task and run the task_work, regardless of whether the task is currently
21  * reschedule IPI to force the targeted task to reschedule and run task_work.
23  * task_work be run as soon as possible, just whenever the task enters the
25  * @TWA_RESUME work is run only when the task exits the kernel and returns to
28  * Fails if the @task is exiting/exited and thus it can't process this @work.
29  * Otherwise @work->func() will be called when the @task goes through one of
32  * If the targeted task is exiting, then an error is returned and the work item
42 int task_work_add(struct task_struct *task, struct callback_head *work,  in task_work_add()  argument
50 	head = READ_ONCE(task->task_works);  in task_work_add()
55 	} while (!try_cmpxchg(&task->task_works, &head, work));  in task_work_add()
61 		set_notify_resume(task);  in task_work_add()
64 		set_notify_signal(task);  in task_work_add()
67 		__set_notify_signal(task);  in task_work_add()
79  * @task: the task which should execute the work
86 task_work_cancel_match(struct task_struct *task,  in task_work_cancel_match()  argument
90 	struct callback_head **pprev = &task->task_works;  in task_work_cancel_match()
94 	if (likely(!task_work_pending(task)))  in task_work_cancel_match()
102 	raw_spin_lock_irqsave(&task->pi_lock, flags);  in task_work_cancel_match()
111 	raw_spin_unlock_irqrestore(&task->pi_lock, flags);  in task_work_cancel_match()
123  * @task: the task which should execute the work
133 task_work_cancel(struct task_struct *task, task_work_func_t func)  in task_work_cancel()  argument
135 	return task_work_cancel_match(task, task_work_func_match, func);  in task_work_cancel()
142  * Called before the task returns to the user-mode or stops, or when
148 	struct task_struct *task = current;  in task_work_run()  local
156 		work = READ_ONCE(task->task_works);  in task_work_run()
160 				if (task->flags & PF_EXITING)  in task_work_run()
165 		} while (!try_cmpxchg(&task->task_works, &work, head));  in task_work_run()
174 		raw_spin_lock_irq(&task->pi_lock);  in task_work_run()
175 		raw_spin_unlock_irq(&task->pi_lock);  in task_work_run()