[RFC PATCH v3 32/35] mm: Modify move_freepages() to handle pages in the region allocator properly

There are situations in which the memory management subsystem needs to move pages from one migratetype to another, such as when setting up the per-zone migrate reserves (where freepages are moved from MIGRATE_MOVABLE to MIGRATE_RESERVE freelists). But the existing code that does freepage movement

[RFC PATCH v3 32/35] mm: Modify move_freepages() to handle pages in the region allocator properly

There are situations in which the memory management subsystem needs to move pages from one migratetype to another, such as when setting up the per-zone migrate reserves (where freepages are moved from MIGRATE_MOVABLE to MIGRATE_RESERVE freelists). But the existing code that does freepage movement