Re: [PATCH 13/15] mm, devmap: introduce CONFIG_DEVMAP_MANAGED_PAGES

[Christoph Hellwig]

On Tue, Oct 31, 2017 at 04:22:46PM -0700, Dan Williams wrote:
> Combine the now three use cases of page-idle callbacks for ZONE_DEVICE
> memory into a common selectable symbol.

Very sparse changelog.  I understand the Kconfig bit, but it also seems to
introduce new static key functionality that isn't explained at all.