Merge branch 'stacking-fixes' (vfs stacking fixes from Jann)

Merge filesystem stacking fixes from Jann Horn.

* emailed patches from Jann Horn <jannh@google.com>:
  sched: panic on corrupted stack end
  ecryptfs: forbid opening files without mmap handler
  proc: prevent stacking filesystems on top
static inline int tg_has_rt_tasks(struct task_group *tg)
{
	struct task_struct *g, *p;

	/*
	 * Autogroups do not have RT tasks; see autogroup_create().
	 */
	if (task_group_is_autogroup(tg))
		return 0;

	for_each_process_thread(g, p) {
		if (rt_task(p) && task_group(p) == tg)
			return 1;
	}

	return 0;
}

static inline int tg_has_rt_tasks(struct task_group *tg)
{
	struct task_struct *g, *p;

	/*
	 * Autogroups do not have RT tasks; see autogroup_create().
	 */
	if (task_group_is_autogroup(tg))
		return 0;

	for_each_process_thread(g, p) {
		if (rt_task(p) && task_group(p) == tg)
			return 1;
	}

	return 0;
}
