linux-kernel - Re: Extending page pinning into fs/direct-io.c

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Date:   Thu, 25 May 2023 18:07:23 +0100
From:   David Howells <dhowells@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     dhowells@...hat.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Extending page pinning into fs/direct-io.c

David Hildenbrand <david@...hat.com> wrote:

> I think the correct way to test for a zero page is
> is_zero_pfn(page_to_pfn(page).
> 
> Using my_zero_pfn(vmf->address) in do_anonymous_page() these can easily end up
> in any process.

Should everywhere that is using ZERO_PAGE(0) actually be using my_zero_pfn()?

ZERO_PAGE() could do with a kdoc comment saying how to use it.

David