sched, nohz: Change rq->nr_running to always use wrappers
Sometimes ->nr_running may cross 2 but interrupt is not being sent to rq's cpu. In this case we don't reenable the timer. Looks like this may be the reason for rare unexpected effects, if nohz is enabled. Patch replaces all places of direct changing of nr_running and makes add_nr_running() caring about crossing border. Signed-off-by: NKirill Tkhai <tkhai@yandex.ru> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20140508225830.2469.97461.stgit@localhostSigned-off-by: NIngo Molnar <mingo@kernel.org>
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