9  * task_work_add - ask the @task to execute @work->func()
11  * @work: the callback to run
14  * Queue @work for task_work_run() below and notify the @task if @notify
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
47 	/* record the work call stack in order to print it in KASAN reports */  in task_work_add()
48 	kasan_record_aux_stack(work);  in task_work_add()
54 		work->next = head;  in task_work_add()
55 	} while (!try_cmpxchg(&task->task_works, &head, work));  in task_work_add()
78  * task_work_cancel_match - cancel a pending work added by task_work_add()
79  * @task: the task which should execute the work
83  * The found work or NULL if not found.
91 	struct callback_head *work;  in task_work_cancel_match()  local
99 	 * new entry before this work, we will find it again. Or  in task_work_cancel_match()
103 	work = READ_ONCE(*pprev);  in task_work_cancel_match()
104 	while (work) {  in task_work_cancel_match()
105 		if (!match(work, data)) {  in task_work_cancel_match()
106 			pprev = &work->next;  in task_work_cancel_match()
107 			work = READ_ONCE(*pprev);  in task_work_cancel_match()
108 		} else if (try_cmpxchg(pprev, &work, work->next))  in task_work_cancel_match()
113 	return work;  in task_work_cancel_match()
122  * task_work_cancel - cancel a pending work added by task_work_add()
123  * @task: the task which should execute the work
124  * @func: identifies the work to remove
126  * Find the last queued pending work with ->func == @func and remove
130  * The found work or NULL if not found.
144  * new work after task_work_run() returns.
149 	struct callback_head *work, *head, *next;  in task_work_run()  local
153 		 * work->func() can do task_work_add(), do not set  in task_work_run()
156 		work = READ_ONCE(task->task_works);  in task_work_run()
159 			if (!work) {  in task_work_run()
165 		} while (!try_cmpxchg(&task->task_works, &work, head));  in task_work_run()
167 		if (!work)  in task_work_run()
171 		 * the first entry == work, cmpxchg(task_works) must fail.  in task_work_run()
178 			next = work->next;  in task_work_run()
179 			work->func(work);  in task_work_run()
180 			work = next;  in task_work_run()
182 		} while (work);  in task_work_run()