On Wed, 2017-04-12 at 03:42 +1000, Oliver O'Halloran wrote:

Adds support to powerpc for the altmap feature of ZONE_DEVICE memory. An
altmap is a driver provided region that is used to provide the backing
storage for the struct pages of ZONE_DEVICE memory. In situations where
large amount of ZONE_DEVICE memory is being added to the system the
altmap reduces pressure on main system memory by allowing the mm/
metadata to be stored on the device itself rather in main memory.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
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Reviewed-by: Balbir Singh <bsingharora@gmail.com>