Re: [PATCH] Extend mwait idle to optimize away CAL and RESinterrupts to an idle CPU -v1

[Yong Zhang]

On Thu, Feb 23, 2012 at 11:34:11AM -0800, Venki Pallipadi wrote:
> On Thu, Feb 23, 2012 at 1:30 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> > Why not scheduler_ipi()?
> 
> Was trying to avoid irq_enter/exit. As the work here is done in idle
> thread context, I though we could avoid enter/exit. 

It seems we could not.
At least RCU need it, see commit c5d753a55, otherwise we will get
warning like 'RCU used illegally from extended quiescent state!'

Thanks,
Yong
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