linux/kernel/sched/auto_group.h
Ingo Molnar c1ad41f1f7 Revert "sched/autogroup: Fix crash on reboot when autogroup is disabled"
This reverts commit 5258f386ea,
because the underlying autogroups bug got fixed upstream in
a better way, via:

  fd8ef11730 Revert "sched, autogroup: Stop going ahead if autogroup is disabled"

Cc: Mike Galbraith <efault@gmx.de>
Cc: Yong Zhang <yong.zhang0@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-12-11 10:23:45 +01:00

65 lines
1.5 KiB
C

#ifdef CONFIG_SCHED_AUTOGROUP
#include <linux/kref.h>
#include <linux/rwsem.h>
struct autogroup {
/*
* reference doesn't mean how many thread attach to this
* autogroup now. It just stands for the number of task
* could use this autogroup.
*/
struct kref kref;
struct task_group *tg;
struct rw_semaphore lock;
unsigned long id;
int nice;
};
extern void autogroup_init(struct task_struct *init_task);
extern void autogroup_free(struct task_group *tg);
static inline bool task_group_is_autogroup(struct task_group *tg)
{
return !!tg->autogroup;
}
extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg)
{
int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
if (enabled && task_wants_autogroup(p, tg))
return p->signal->autogroup->tg;
return tg;
}
extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
#else /* !CONFIG_SCHED_AUTOGROUP */
static inline void autogroup_init(struct task_struct *init_task) { }
static inline void autogroup_free(struct task_group *tg) { }
static inline bool task_group_is_autogroup(struct task_group *tg)
{
return 0;
}
static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg)
{
return tg;
}
#ifdef CONFIG_SCHED_DEBUG
static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
{
return 0;
}
#endif
#endif /* CONFIG_SCHED_AUTOGROUP */