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Date: Fri, 2 Mar 2018 23:57:34 +0100
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v5 00/12] vfio, dax: prevent long term filesystem-dax
	pins and other fixes
Message-ID: <20180302225734.GE31240@lst.de>
References: <151996281307.28483.12343847096989509127.stgit@dwillia2-desk3.amr.corp.intel.com> <20180302221020.GA30722@lst.de> <CAPcyv4gKyvkHY_qQTYvd8wrLpaXXciJyWZY+9T7Q_Eg-Zuxpgw@mail.gmail.com>
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To: Dan Williams <dan.j.williams@intel.com>
Cc: Christoph Hellwig <hch@lst.de>, linux-nvdimm <linux-nvdimm@lists.01.org>, linux-xfs <linux-xfs@vger.kernel.org>, "Darrick J. Wong" <darrick.wong@oracle.com>, KVM list <kvm@vger.kernel.org>, Haozhong Zhang <haozhong.zhang@intel.com>, Jane Chu <jane.chu@oracle.com>, Alexander Viro <viro@zeniv.linux.org.uk>, Gerd Rausch <gerd.rausch@oracle.com>, stable <stable@vger.kernel.org>, Jan Kara <jack@suse.cz>, Michal Hocko <mhocko@suse.com>, Andreas Dilger <adilger.kernel@dilger.ca>, Ross Zwisler <ross.zwisler@linux.intel.com>, Matthew Wilcox <mawilcox@microsoft.com>, linux-fsdevel <linux-fsdevel@vger.kernel.org>, Alex Williamson <alex.williamson@redhat.com>, Theodore Ts'o <tytso@mit.edu>, Linux MM <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

On Fri, Mar 02, 2018 at 02:21:40PM -0800, Dan Williams wrote:
> They are indeed a hodge-podge. The problem is that the current
> IS_DAX() is broken. So I'd like to propose fixing IS_DAX() with
> IS_FSDAX() + IS_DEVDAX() for 4.16-rc4 and queue up these wider reworks
> you propose for the next merge window.

The only thing broken about IS_DAX are the code elimination games
based on the CONFIG_* flags.  Remove those and just add proper stubs
for the dax routines and everything will be fine for now until we can
kill that inode flag.

IS_FSDAX and IS_DEVDAX on the other hand are a giant mess that isn't
helping anyone.

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