linux-kernel - Re: [PATCH] mm/rmap: convert __page_check_anon

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Date:   Fri, 15 Sep 2023 14:49:39 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Yajun Deng <yajun.deng@...ux.dev>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/rmap: convert __page_check_anon_rmap() to folio

On Fri, Sep 15, 2023 at 06:17:31PM +0800, Yajun Deng wrote:
> @@ -1176,8 +1175,8 @@ static void __page_check_anon_rmap(struct folio *folio, struct page *page,
>  	 */
>  	VM_BUG_ON_FOLIO(folio_anon_vma(folio)->root != vma->anon_vma->root,
>  			folio);
> -	VM_BUG_ON_PAGE(page_to_pgoff(page) != linear_page_index(vma, address),
> -		       page);
> +	VM_BUG_ON_FOLIO(folio_pgoff(folio) != linear_page_index(vma, address),
> +		       folio);

No, this is not equivalent.  You haven't hit any problems testing it
because you don't have large anonymous folios.