Re: [patch 02/14] x86/apic: Implement single target IPI function for x2apic_cluster

From: Thomas Gleixner
Date: Thu Nov 05 2015 - 03:05:08 EST

On Wed, 4 Nov 2015, Linus Torvalds wrote:

> On Wed, Nov 4, 2015 at 10:38 PM, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> >
> > but in the above sequence I think we can do even better: we don't need the
> > local_irq_save()/restore() I think.
> Right. Thomas added that one to my patch.
> I don't think he realized just *how* trivial sending a single IPI is
> with the x2apic, and just how horribly nasty the mask case is in
> comparison (and how nasty it is that we historically turn a the single
> ipi into a mask).

Yeah, I was too tired to look at the details. Will fix that up for the
other trivial cases as well.


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