1#ifdef CONFIG_SCHED_AUTOGROUP
 2
 3#include <linux/kref.h>
 4#include <linux/rwsem.h>
 5
 6struct autogroup {
 7	/*
 8	 * reference doesn't mean how many thread attach to this
 9	 * autogroup now. It just stands for the number of task
10	 * could use this autogroup.
11	 */
12	struct kref		kref;
13	struct task_group	*tg;
14	struct rw_semaphore	lock;
15	unsigned long		id;
16	int			nice;
17};
18
19extern void autogroup_init(struct task_struct *init_task);
20extern void autogroup_free(struct task_group *tg);
21
22static inline bool task_group_is_autogroup(struct task_group *tg)
23{
24	return !!tg->autogroup;
25}
26
27extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
28
29static inline struct task_group *
30autogroup_task_group(struct task_struct *p, struct task_group *tg)
31{
32	int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
33
34	if (enabled && task_wants_autogroup(p, tg))
35		return p->signal->autogroup->tg;
36
37	return tg;
38}
39
40extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
41
42#else /* !CONFIG_SCHED_AUTOGROUP */
43
44static inline void autogroup_init(struct task_struct *init_task) {  }
45static inline void autogroup_free(struct task_group *tg) { }
46static inline bool task_group_is_autogroup(struct task_group *tg)
47{
48	return 0;
49}
50
51static inline struct task_group *
52autogroup_task_group(struct task_struct *p, struct task_group *tg)
53{
54	return tg;
55}
56
57#ifdef CONFIG_SCHED_DEBUG
58static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
59{
60	return 0;
61}
62#endif
63
64#endif /* CONFIG_SCHED_AUTOGROUP */