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cpu bit in the nohz.idle_cpu_mask are reset in the first busy tick after exiting idle. So during nohz_idle_balance(), intention is to double check if the cpu that is part of the idle_cpu_mask is indeed idle before going ahead in performing idle balance for that cpu. Fix the cpu typo in the idle_cpu() check during nohz_idle_balance(). Reported-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1323199177.1984.12.camel@sbsiddha-desk.sc.intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>