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

Christoph Hellwig
2020-09-15T17:19:35Z

On Mon, Sep 14, 2020 at 04:53:25PM -0700, Ralph Campbell wrote:
> Since set_page_refcounted() is defined in mm_interal.h I would have to
> move the definition to someplace like page_ref.h or have the drivers
> cal init_page_count() or set_page_count() since get_page() calls
> VM_BUG_ON_PAGE() if refcount == 0.
> I'll move set_page_refcounted() since that is what the page allocator
> uses and seems named for the purpose.

I don't think any of the three ->page_free instances even cares about
the page refcount.