linux-kernel - Use of VM_IOREMAP in xenbus

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Message-ID: <20200409061846.GA30241@lst.de>
Date:   Thu, 9 Apr 2020 08:18:46 +0200
From:   Christoph Hellwig <hch@....de>
To:     Wei Liu <wei.liu2@...rix.com>
Cc:     Bob Liu <bob.liu@...cle.com>,
        Paul Durrant <paul.durrant@...rix.com>,
        Konrad Wilk <konrad.wilk@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        David Vrabel <david.vrabel@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Use of VM_IOREMAP in xenbus

Hi Wei,

commit ccc9d90a9a8b5 ("xenbus_client: Extend interface to support
multi-page ring") addes a use of vmap in what is now
xenbus_map_ring_valloc_hvm, and uses the VM_IOREMAP flag that is
only really intended for implementing ioremap.  Do you remember
what the reason is that this flag was used?