Re: [PATCH 03/13] rcu: Exclude all potential timekeepers fromsysidle detection

[Peter Zijlstra]

On Wed, Dec 18, 2013 at 12:43:18PM +0100, Peter Zijlstra wrote:
> On Wed, Dec 18, 2013 at 12:49:15AM +0100, Frederic Weisbecker wrote:
> > That's to start simple as CPU 0 can't be offlined.
> 
> Yes it can, see CONFIG_BOOTPARAM_HOTPLUG_CPU0

Also, that's a traditional weirdness of x86. Other archs might not have
this constraint at all and can hotplug any cpu.

So relying on the fact that cpu 0 cannot be hotplugged is broken.
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