/* Returns true if the task does not share ->mm with another thread/process.  */
bool current_is_single_threaded(void)
/* Returns true if the task does not share ->mm with another thread/process.  */
bool current_is_single_threaded(void)
{
	struct task_struct *task = current;
	struct mm_struct *mm = task->mm;
	struct task_struct *p, *t;
	bool ret;
	if (atomic_read(&task->signal->live) != 1)
		return false;
	if (atomic_read(&mm->mm_users) == 1)
		return true;
	ret = false;
	rcu_read_lock();
	for_each_process(p) {
		if (unlikely(p->flags & PF_KTHREAD))
			continue;
		if (unlikely(p == task->group_leader))
			continue;
		t = p;
		do {
			if (unlikely(t->mm == mm))
				goto found;
			if (likely(t->mm))
				break;
			smp_rmb();
		} while_each_thread(p, t);
	}
	ret = true;
found:
	rcu_read_unlock();
	return ret;
}