Re: [PATCH] rcu: Is it safe to enter an RCU read-side criticalsection?

[Peter Zijlstra]

On Mon, Sep 09, 2013 at 04:40:38PM +0200, Frederic Weisbecker wrote:
> > If the state migrates with a task from one CPU to another, it's a task
> > state.
> 
> This applies to preempt_count as well.

This is in fact true. Its something I'd like to cure, but currently the
PREEMPT_ACTIVE state makes this so.

Hence the need to save/restore the per-cpu preempt state in the per-cpu
preempt_count patches.
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