Re: [PATCH 2/2] i7300_idle driver v1.55

From: Andi Kleen
Date: Thu Oct 23 2008 - 08:26:48 EST

This should not matter as we can safely remove the module even when
one or more CPUs are idle. As long as one CPU is running, we are sure
that throttling is not in effect. And as long as we make sure no one
is executing the notifier that is going to be rmmoded, we should
be OK. Say one CPU comes out of the idle later, it wont see the notifier
in the notifier list anymore, because of RCU in atomic notifier
and things will work fine. I mean we are not rmmoding the routine
that enters the idle state. We are just rmmoding the routine that
Can get called before and after idle routine.

That means there is a ordering dependency between the RCU idle
state getting updated and your code running. That is what I meant with
"very careful with idle". Even if it worked right now would
seem fragile to me.

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