linux-kernel - Re: [PATCH v21 0/6] block: Use page pinning

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Message-ID: <3206939.1684913739@warthog.procyon.org.uk>
Date:   Wed, 24 May 2023 08:35:39 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     dhowells@...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>,
        David Hildenbrand <david@...hat.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,
        Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH v21 0/6] block: Use page pinning

Christoph Hellwig <hch@...radead.org> wrote:

> > Applied, thanks!
> 
> This ended up on the for-6.5/block branch, but I think it needs to be
> on the splice one, as that is pre-requisite unless I'm missing
> something.

Indeed.  As I noted in the cover note:

    This requires the splice-read patchset to have been applied first,
    otherwise reversion of the ITER_PAGE iterator can race with truncate and
    return pages to the allocator whilst they're still undergoing DMA[2].

David