linux-kernel - Re: [PATCH v6 03/34] iov_iter: Pass I/O direction into iov_iter_get

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Message-ID: <Y8jZhKTSYm36hw8T@infradead.org>
Date:   Wed, 18 Jan 2023 21:47:48 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v6 03/34] iov_iter: Pass I/O direction into
 iov_iter_get_pages*()

On Thu, Jan 19, 2023 at 02:11:19AM +0000, Al Viro wrote:
> PS: Documentation/driver-api/pci/p2pdma.rst seems to imply that those
> pages should not be possible to mmap, so either that needs to be
> updated, or... how the hell could we run into those in g-u-p,
> anyway?  Really confused...

Yes, that needs an update.  That limitation was from before the
mmap support was added.