static void rcu_free_slab(struct rcu_head *h)
{
	struct page *page = container_of(h, struct page, rcu_head);

	__free_slab(page->slab_cache, page);
}
static void rcu_free_slab(struct rcu_head *h)
{
	struct page *page = container_of(h, struct page, rcu_head);

	__free_slab(page->slab_cache, page);
}