That looks like it could users without a xmit_cong_map function. The other half seems to be caused by
commit 77dd550e5547846604ff6f90c4dc6bba4414e485
RDS: Stop supporting old cong map sending method
which also changes the users that had one to use a special case in the xmit function. Both changes were introduced with 2.6.37. So I believe Maverick and before are actually unaffected.
This one hurts my head. I *think* half of the breakage was actually done by
commit 5b2366bd2835919 e2e6a836e837eab 4a9274bd46
RDS: Rewrite rds_send_xmit
That looks like it could users without a xmit_cong_map function. The other half seems to be caused by
commit 77dd550e5547846 604ff6f90c4dc6b ba4414e485
RDS: Stop supporting old cong map sending method
which also changes the users that had one to use a special case in the xmit function. Both changes were introduced with 2.6.37. So I believe Maverick and before are actually unaffected.