int split_huge_page(struct page *page)
{
	struct anon_vma *anon_vma;
	int ret = 1;

	BUG_ON(!PageAnon(page));
	anon_vma = page_lock_anon_vma(page);
	if (!anon_vma)
		goto out;
	ret = 0;
	if (!PageCompound(page))
		goto out_unlock;

	BUG_ON(!PageSwapBacked(page));
	__split_huge_page(page, anon_vma);
	count_vm_event(THP_SPLIT);

	BUG_ON(PageCompound(page));
out_unlock:
	page_unlock_anon_vma(anon_vma);
out:
	return ret;
}
int split_huge_page(struct page *page)
{
	struct anon_vma *anon_vma;
	int ret = 1;

	BUG_ON(!PageAnon(page));
	anon_vma = page_lock_anon_vma(page);
	if (!anon_vma)
		goto out;
	ret = 0;
	if (!PageCompound(page))
		goto out_unlock;

	BUG_ON(!PageSwapBacked(page));
	__split_huge_page(page, anon_vma);
	count_vm_event(THP_SPLIT);

	BUG_ON(PageCompound(page));
out_unlock:
	page_unlock_anon_vma(anon_vma);
out:
	return ret;
}