1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifdef CONFIG_SCHED_AUTOGROUP
 3
 4struct autogroup {
 5	/*
 6	 * Reference doesn't mean how many threads attach to this
 7	 * autogroup now. It just stands for the number of tasks
 8	 * which could use this autogroup.
 9	 */
10	struct kref		kref;
11	struct task_group	*tg;
12	struct rw_semaphore	lock;
13	unsigned long		id;
14	int			nice;
15};
16
17extern void autogroup_init(struct task_struct *init_task);
18extern void autogroup_free(struct task_group *tg);
19
20static inline bool task_group_is_autogroup(struct task_group *tg)
21{
22	return !!tg->autogroup;
23}
24
25extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
26
27static inline struct task_group *
28autogroup_task_group(struct task_struct *p, struct task_group *tg)
29{
30	int enabled = READ_ONCE(sysctl_sched_autogroup_enabled);
31
32	if (enabled && task_wants_autogroup(p, tg))
33		return p->signal->autogroup->tg;
34
35	return tg;
36}
37
38extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
39
40#else /* !CONFIG_SCHED_AUTOGROUP */
41
42static inline void autogroup_init(struct task_struct *init_task) {  }
43static inline void autogroup_free(struct task_group *tg) { }
44static inline bool task_group_is_autogroup(struct task_group *tg)
45{
46	return 0;
47}
48
49static inline struct task_group *
50autogroup_task_group(struct task_struct *p, struct task_group *tg)
51{
52	return tg;
53}
54
55static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
56{
57	return 0;
58}
59
60#endif /* CONFIG_SCHED_AUTOGROUP */