On Thu, Mar 16, 2017 at 12:05:22PM -0400, J?r?me Glisse wrote: > When a ZONE_DEVICE page refcount reach 1 it means it is free and nobody > is holding a reference on it (only device to which the memory belong do). > Add a callback and call it when that happen so device driver can implement > their own free page management. >
If it does not implement it's own management then it still needs to be freed to the main allocator.
