EWMA incompatible in v4.11(-rc*)
Johannes Berg introduced an API change in net.git. This is rather unexpected because such changes are usually only accepted before the Linus' merge window and only in net-next.git
This change results in a BUILD_BUG because the the batman-adv "precision" is still 1024 (which is a lot larger than the supporter maximum of 30).
The change has to be imported into maint and compat code has to be written that always replaces DECLARE_EWMA with a batman-adv specific version. A similar change has to be introduced in openwrt-routing to avoid problems when the wifi driver (and its compat DECLARE_EWMA code) is changed/upgraded.