>  	spin_lock(&hugetlb_lock);
quoted text
> -	if (h->surplus_huge_pages_node[nid]) {
> +	if (h->surplus_huge_pages_node[nid] && h->order <= MAX_ORDER) {

As Andrew Hastings pointed out earlier this all needs to be h->order < MAX_ORDER
[got pretty much all the checks wrong off by one]. It won't affect anything
on x86-64 but might cause problems on archs which have exactly MAX_ORDER
sized huge pages.

quoted text
>  		update_and_free_page(h, page);
>  		h->surplus_huge_pages--;
>  		h->surplus_huge_pages_node[nid]--;
> @@ -220,6 +221,9 @@ static struct page *alloc_fresh_huge_pag
>  {
>  	struct page *page;
>  
> +	if (h->order > MAX_ORDER)

quoted text
>= etc.

-Andi
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