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SubjectRe: [PATCH 4/5] kvm: Replace vcpu->swait with rcuwait
On Thu, Apr 23, 2020 at 10:57:57AM +0200, Paolo Bonzini wrote:
> On 23/04/20 10:41, Marc Zyngier wrote:
> >>
> >> - if (swait_active(kvm_arch_vcpu_wq(vcpu)))
> >> + if (rcu_dereference(kvm_arch_vpu_get_wait(vcpu)) != NULL)
> > This doesn't compile (wrong function name, and rcu_dereference takes a
> > variable). But whatever it would do if we fixed it looks dodgy. it isn't
> > the rcuwait structure that you want to dereference, but rcuwait->task
> > (we are checking whether we are called because we are blocking or being
> > preempted).
> >
>
> Yes, I agree. Replacing swait with rcuwait is all good, but please make
> the API look the same first. Just like you added prepare_to_rcuwait and
> finish_rcuwait, let's add rcuwait_active as well.
>
> Actually let's do it like this:
>
> 1) Davidlohr, please post only patches 1-3 to "equalize" the swait and
> rcuwait APIs.
>
> 2) Peter, please prepare a topic branch for those, or provide Acked-by

I don't think I have anything that conflicts with this, so sure, take
the whole thing through KVM.

For 1-3 (and I'll send a small niggle for 3 right after this):

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

I'll keep 5 as it is unrelated.

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