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From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@nvidia.com>
Subject: Re: [PATCH v6 01/10] mm: add zone device coherent type memory support
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On Tue, Feb 15, 2022 at 10:45:24AM -0400, Jason Gunthorpe wrote:
> > Do you know if DEVICE_GENERIC pages would end up as PageAnon()? My
> > assumption was that they would be part of a special mapping.
> 
> We need to stop using the special PTEs and VMAs for things that have a
> struct page. This is a mistake DAX created that must be undone.

Yes, we'll get to it.  Maybe we can do it for the non-DAX devmap
ptes first given that DAX is more complicated.