sched: Fix hotplug hang
The hot-unplug kstopmachine usage does a wakeup after deactivating the cpu, hence we cannot use cpu_active() here but must rely on the good olde online. Reported-by: NSachin Sant <sachinp@in.ibm.com> Reported-by: NJens Axboe <jens.axboe@oracle.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Tested-by: NJens Axboe <jens.axboe@oracle.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> LKML-Reference: <1261326987.4314.24.camel@laptop> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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