static ssize_t ctor_show(struct kmem_cache *s, char *buf)
{
	if (!s->ctor)
		return 0;
	return sprintf(buf, "%pS\n", s->ctor);
}
static ssize_t ctor_show(struct kmem_cache *s, char *buf)
{
	if (!s->ctor)
		return 0;
	return sprintf(buf, "%pS\n", s->ctor);
}