Hello,

This series is a series of cleanups to cgroup_attach_proc. The
series will apply cleanly against cgroup/for-3.3.

There may be some collisions once Frederic's series is applied:

https://lkml.org/lkml/2011/12/20/260

So I may need to resend.

[1 V3] cgroup: remove redundate get/put of old css_set from migrate
[2] cgroup: remove redundant get/put of task struct
[3] cgroup: only need to check oldcgrp==newgrp once
[4] cgroup: remove extra calls to find_existing_css_set
[5] cgroup: separate out cgroup_attach_proc error handling code

Regards,
Mandeep