Re: [PATCH] mm: remove extra ZONE_DEVICE struct page refcount

[Ralph Campbell]

On 9/15/20 11:10 PM, Christoph Hellwig wrote:
> On Mon, Sep 14, 2020 at 04:10:38PM -0700, Dan Williams wrote:
> > You also need to fix up ext4_break_layouts() and
> > xfs_break_dax_layouts() to expect ->_refcount is 0 instead of 1. This
> > also needs some fstests exposure.
>
> While we're at it, can we add a wait_fsdax_unref helper macro that hides
> the _refcount access from the file systems?

Sure. I'll add a separate patch for it in v2.