mm: untangle config dependencies for demote-on-reclaim

At the time demote-on-reclaim was introduced, it was tied to
CONFIG_HOTPLUG_CPU + CONFIG_MIGRATE, but that is not really accurate.

The only two things we need to depend on are CONFIG_NUMA + CONFIG_MIGRATE,
so clean this up.  Furthermore, we only register the hotplug memory
notifier when the system has CONFIG_MEMORY_HOTPLUG.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Oscar Salvador <[email protected]>
Suggested-by: "Huang, Ying" <[email protected]>
Reviewed-by: "Huang, Ying" <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Abhishek Goel <[email protected]>
Cc: Baolin Wang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions