sched/fair: Make calculate_imbalance() independent
Rik noticed that calculate_imbalance() relies on update_sd_pick_busiest() to guarantee that busiest->sum_nr_running > busiest->group_capacity_factor. Break this implicit assumption (with the intent of not providing it anymore) by having calculat_imbalance() verify it and not rely on others. Reported-by: NRik van Riel <riel@redhat.com> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Acked-by: NVincent Guittot <vincent.guittot@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/20140729152631.GW12054@laptop.lanSigned-off-by: NIngo Molnar <mingo@kernel.org>
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