4 Post RELENG_5 direction

The focus should be bug fixes and incremental improvements, as with all the -STABLE development branches. Following the usual procedure, everything should be vetted through the HEAD branch first and committed to RELENG_5 with caution. New device drivers, incremental features, etc, will be welcome in the branch once they have been tested in HEAD and found stable enough.

Further SMPng lockdowns will be divided into two categories: driver and subsystem. The only subsystem that will be sufficiently locked down for RELENG_5 will be GEOM, so incrementally locking down device drivers under it is a worthy goal for the branch. Full subsystem lockdowns will have to be fully tested and proven in HEAD before consideration will be given to merging them into RELENG_5.