Merge branch 'for-4.12-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...

Pull cgroup fixes from Tejun Heo:
 "Two cgroup fixes. One to address RCU delay of cpuset removal affecting
  userland visible behaviors. The other fixes a race condition between
  controller disable and cgroup removal"

* 'for-4.12-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cpuset: consider dying css as offline
  cgroup: Prevent kill_css() from being called more than once