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

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Message-ID: <264e859c-820f-4001-b5b7-d4011fcbc192@redhat.com>
Date: Fri, 7 Mar 2025 09:10:53 +0100
From: David Hildenbrand <david@...hat.com>
To: Luiz Capitulino <luizcap@...hat.com>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, yuzhao@...gle.com, pasha.tatashin@...een.com
Cc: akpm@...ux-foundation.org, hannes@...xchg.org, muchun.song@...ux.dev
Subject: Re: [PATCH v3 1/3] mm: page_ext: add an iteration API for page
 extensions


> +++ 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@...hat.com>

-- 
Cheers,

David / dhildenb