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Date:   Wed, 18 Jan 2023 21:47:48 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Al Viro <viro@zeniv.linux.org.uk>
Cc:     Christoph Hellwig <hch@infradead.org>,
        David Howells <dhowells@redhat.com>,
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        Peter Zijlstra <peterz@infradead.org>,
        David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH v6 03/34] iov_iter: Pass I/O direction into
 iov_iter_get_pages*()
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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.