Re: [PATCH] sched: idle: move need_resched check after function rcu_idle_enter

From: Peter Zijlstra
Date: Mon Nov 23 2015 - 12:58:03 EST

On Mon, Nov 23, 2015 at 09:42:06AM -0800, Lianwei Wang wrote:
> Issue was found on ARM/Qcom platform, but I think it is applicable to
> other platforms as well. I add a BUG_ON after rcu_enter_idle to catch
> it. The Qcom's cpuidle driver is not in mainline kernel yet.

A: Because it messes up the order in which people normally read text.
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And I suspect that your qualcom thing doesn't have TIF_POLLING_NRFLAG
either, which would introduce another need_resched() test after the
rcu_enter_idle() call.
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