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 void cpu_cgroup_css_released(struct cgroup_subsys_state *css)
{
	struct task_group *tg = css_tg(css);

	sched_offline_group(tg);
}

static void cpu_cgroup_css_released(struct cgroup_subsys_state *css)
{
	struct task_group *tg = css_tg(css);

	sched_offline_group(tg);
}
