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Date: Tue, 22 May 2018 08:28:06 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v10] mm: introduce MEMORY_DEVICE_FS_DAX and
 CONFIG_DEV_PAGEMAP_OPS
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To: Jan Kara <jack@suse.cz>
Cc: Michal Hocko <mhocko@suse.com>, kbuild test robot <lkp@intel.com>, linux-nvdimm <linux-nvdimm@lists.01.org>, Heiko Carstens <heiko.carstens@de.ibm.com>, Linux MM <linux-mm@kvack.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>, =?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>, Gerald Schaefer <gerald.schaefer@de.ibm.com>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Christoph Hellwig <hch@lst.de>, Thomas Meyer <thomas@m3y3r.de>
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On Mon, May 21, 2018 at 11:04:10AM +0200, Jan Kara wrote:
> We definitely do have customers using "execute in place" on s390x from
> dcssblk. I've got about two bug reports for it when customers were updating
> from old kernels using original XIP to kernels using DAX. So we need to
> keep that working.

That is all good an fine, but I think time has come where s390 needs
to migrate to provide the pmem API so that we can get rid of these
special cases.  Especially given that the old XIP/legacy DAX has all
kinds of known bugs at this point in time.
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