sched/idle: Add more comments to the code
The idle main function is a complex and a critical function. Added more comments to the code. Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org> Acked-by: NNicolas Pitre <nico@linaro.org> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Cc: tglx@linutronix.de Cc: rjw@rjwysocki.net Cc: preeti@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1393832934-11625-5-git-send-email-daniel.lezcano@linaro.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
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