linux-kernel - Re: [PATCH v11 26/33] mm/writeback: Add folio_wait

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Message-ID: <815893.1623839446@warthog.procyon.org.uk>
Date:   Wed, 16 Jun 2021 11:30:46 +0100
From:   David Howells <dhowells@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     dhowells@...hat.com, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jeff Layton <jlayton@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>
Subject: Re: [PATCH v11 26/33] mm/writeback: Add folio_wait_writeback()

Matthew Wilcox (Oracle) <willy@...radead.org> wrote:

> +	struct page *page = &folio->page;

Isn't that a layering violation?  Should it be something like:

	struct page *page = folio_head();

or:

	struct page *page = folio_subpage(0);

maybe?