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mm: fix stale ZONE_DEVICE refcount comment
The comment in _init_zone_device_page() still uses the old MEMORY_TYPE* names and implies that FS_DAX pages regain a refcount of 1 in the free path. That no longer matches the code. Update the comm
The comment in _init_zone_device_page() still uses the old MEMORY_TYPE* names and implies that FS_DAX pages regain a refcount of 1 in the free path. That no longer matches the code. Update the comm