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

Linus Torvalds
2015-11-05T06:46:14Z

On Wed, Nov 4, 2015 at 10:38 PM, Ingo Molnar <mingo@kernel.org> 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).

Linus