sched_rt: Fix overload bug on rt group scheduling
Fixes an easily triggerable BUG() when setting process affinities. Make sure to count the number of migratable tasks in the same place: the root rt_rq. Otherwise the number doesn't make sense and we'll hit the BUG in set_cpus_allowed_rt(). Also, make sure we only count tasks, not groups (this is probably already taken care of by the fact that rt_se->nr_cpus_allowed will be 0 for groups, but be more explicit) Tested-by: NThomas Gleixner <tglx@linutronix.de> CC: stable@kernel.org Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: NGregory Haskins <ghaskins@novell.com> LKML-Reference: <1247067476.9777.57.camel@twins> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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