Re: [PATCH v3 1/3] mm: page_ext: add an iteration API for page extensions

[David Hildenbrand <david@redhat.com>]

> +++ b/mm/page_ext.c
> @@ -507,6 +507,19 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
>   
>   #endif
>   
> +/**
> + * page_ext_lookup() - Lookup a page extension for a PFN.
> + * @pfn: PFN of the page we're interested in.
> + *
> + * Must be called with RCU read lock taken and @pfn must be valid.
> + *
> + * Return: NULL if no page_ext exists for this page.
> + */
> +struct page_ext *page_ext_lookup(unsigned long pfn)
> +{
> +	return lookup_page_ext(pfn_to_page(pfn));
> +}
> +
>   /**
>    * page_ext_get() - Get the extended information for a page.
>    * @page: The page we're interested in.

As discussed offline, getting rid of lookup_page_ext() can be done later 
as a cleanup.

Acked-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb