The first patch is simply a cosmetic patch. So far I (and maybe others too?) have been regularly confusing these two structs, therefore I'd suggest renaming them and therefore making the follow-up patches easier to understand and nicer to fit in.
The second patch fixes a minor issue, but probably not worth for stable.
On the other hand the first two patches are also preparations for the third and fourth patch:
These two patches are exporting functionality needed to marry the bridge multicast snooping with the batman-adv multicast optimizations recently added for the 3.15 kernel, allowing to use these optimzations in common setups having a bridge on top of e.g. bat0, too. So far these bridged setups would fall back to simple flooding through the batman-adv mesh network for any multicast packet entering bat0.
More information about the batman-adv multicast optimizations currently implemented can be found here:
http://www.open-mesh.org/projects/batman-adv/wiki/Basic-multicast-optimizati...
The integration on the batman-adv side could afterwards look like this, for instance:
http://git.open-mesh.org/batman-adv.git/commitdiff/576b59dd3e34737c702e548b2...
Changes in v4: - merged header postings from all previous patchset versions
Changes in v3: - use EXPORT_SYMBOL_GPL() instead of EXPORT_SYMBOL()
Changes in v2: - fix a nasty typo in PATCH 1/4, br_multicast_update_query_timer(): "br->multicast_query_interval" vs. "br->multicast_querier_interval" => this accidentally reduced the other querier present timer from 255 to 125 seconds - fix a typo in PATCH 2/4, br_ip{4,6}_multicast_query(): ntohs(ETH_P_{IP,IPV6}) vs. htons(ETH_P_{IP,IPV6}) - add missing ntohl()s before address comparison in PATCH 2/4, br_ip4_multicast_select_querier() (thanks David!)
Cheers, Linus