Re: [PATCH 2/8] hugetlb: add allocate function for hugepage migration

[Wu Fengguang <fengguang.wu@intel.com>]

> +static struct page *alloc_buddy_huge_page_node(struct hstate *h, int nid)
> +{
> +	struct page *page = __alloc_huge_page_node(h, nid);
>  	if (page) {
> -		if (arch_prepare_hugepage(page)) {
> -			__free_pages(page, huge_page_order(h));
> +		set_compound_page_dtor(page, free_huge_page);
> +		spin_lock(&hugetlb_lock);
> +		h->nr_huge_pages++;
> +		h->nr_huge_pages_node[nid]++;
> +		spin_unlock(&hugetlb_lock);
> +		put_page_testzero(page);
> +	}
> +	return page;
> +}

One would expect the alloc_buddy_huge_page_node() to only differ with
alloc_buddy_huge_page() in the alloc_pages/alloc_pages_exact_node
calls. However you implement alloc_buddy_huge_page_node() in a quite
different way. Can the two functions be unified at all?

Thanks,
Fengguang