Re: [PATCH 1/2] mm/page_alloc: free order-0 pages through PCP in page_frag_free()

[Dave Hansen <dave.hansen@xxxxxxxxx>]

On 11/5/18 12:58 AM, Aaron Lu wrote:
> -	if (unlikely(put_page_testzero(page)))
> -		__free_pages_ok(page, compound_order(page));
> +	if (unlikely(put_page_testzero(page))) {
> +		unsigned int order = compound_order(page);
> +
> +		if (order == 0)
> +			free_unref_page(page);
> +		else
> +			__free_pages_ok(page, order);
> +	}
>  }

This little hunk seems repeated in __free_pages() and
__page_frag_cache_drain().  Do we need a common helper?