static ssize_t shrink_store(struct kmem_cache *s,
			const char *buf, size_t length)
{
	if (buf[0] == '1')
		kmem_cache_shrink_all(s);
	else
		return -EINVAL;
	return length;
}
static ssize_t shrink_store(struct kmem_cache *s,
			const char *buf, size_t length)
{
	if (buf[0] == '1')
		kmem_cache_shrink_all(s);
	else
		return -EINVAL;
	return length;
}