sched: move rcu_head to task_group struct
Peter Zijlstra noticed that the rcu_head object need not be present in every cfs_rq of a group. Move it to the task_group structure instead. Signed-off-by: NSrivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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