OK so my thought was totally wrong. I thought the longterm stable releases will still get bugfixed by SGI or whoever wrote the stuff. Sorry for that then. But what is then the idea of a longterm stable?So who keeps track on which patches needs to get backported or not? And who will backport XFS fixes back to 2.6.32?
An interested kernel developer. They can become interested because they personally have the time or interest, or because someone pays them to become interested. Support of the stable kernel series is not something that happens magically, or which is funded by a charity, you know. That's why some companies pay $$$ for a supported distribution kernel.