David Hildenbrand [off-list ref] writes:

We always have to initialize the balloon_dev_info, even when compaction
is not configured in: otherwise the containing list and the lock are
left uninitialized.

Agreed cmm uses balloon_dev_info infrastructure beyond just
CONFIG_BALLOON_COMPACTION, so it should be initialized by default.

The patch looks good to me. Please feel free to add:

Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>