Re: [HMM v16 01/15] mm/memory/hotplug: convert device bool to int to allow for more flags v2

[Balbir Singh]

On Thu, Jan 12, 2017 at 11:30:28AM -0500, Jérôme Glisse wrote:
> When hotpluging memory we want more informations on the type of memory and
> its properties. Replace the device boolean flag by an int and define a set
> of flags.
> 
> New property for device memory is an opt-in flag to allow page migration
> from and to a ZONE_DEVICE. Existing user of ZONE_DEVICE are not expecting
> page migration to work for their pages. New changes to page migration i
> changing that and we now need a flag to explicitly opt-in page migration.

Given that ZONE_DEVICE is dependent on X86_64, do we need to touch all
architectures? I guess we could selectively enable things as we enable
ZONE_DEVICE for other architectures?

Balbir Singh.