From: Michal Hocko <mhocko@xxxxxxxx>
COMPACTION_STATUS resp. ZONE_TYPE are currently used to translate enum
compact_result resp. struct zone index into their symbolic names for
an easier post processing. The follow up patch would like to reuse
this as well. The code involves some preprocessor black magic which is
better not duplicated elsewhere so move it to a common mm tracing relate
header.
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>