linux-kernel - Re: [RFC PATCH v2 1/3] mm: Don't pin ZERO_PAGE in pin_user

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Message-ID: <13ddccb0-c045-4fd7-a495-b0ffe7796bbc@lucifer.local>
Date:   Fri, 26 May 2023 09:27:37 +0100
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     David Howells <dhowells@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        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>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH v2 1/3] mm: Don't pin ZERO_PAGE in pin_user_pages()

On Fri, May 26, 2023 at 01:22:54AM -0700, Christoph Hellwig wrote:
> Shouldn't unpin_user_pages and bio_release_page also be updated to
> skip a zero page here?
>

unpin_user_pages*() all call gup_put_folio() which already skips the zero page
so we should be covered on that front.