linux-kernel - Re: [PATCH] KVM: arm64: vgic: Remove duplicate check in update_affinity

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Date:   Sat, 24 Sep 2022 12:56:59 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Gavin Shan <gshan@...hat.com>
Cc:     kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        will@...nel.org, eric.auger@...hat.com, yuzhe@...china.com,
        oliver.upton@...ux.dev, shan.gavin@...il.com,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexandru Elisei <Alexandru.Elisei@....com>
Subject: Re: [PATCH] KVM: arm64: vgic: Remove duplicate check in update_affinity_collection()

Gavin,

Side note: please make sure you always Cc all the KVM/arm64 reviewers
when sending patches (now added).

On Fri, 23 Sep 2022 07:54:47 +0100,
Gavin Shan <gshan@...hat.com> wrote:
> 
> The ITS collection is guranteed to be !NULL when update_affinity_collection()
> is called. So we needn't check ITE's collection with NULL because the
> check has been included to the later one.

It took me a while to understand what you meant by this: the 'coll'
parameter to update_affinity_collection() is never NULL, so comparing
it with 'ite->collection' is enough to cover both the NULL case and
the "another collection" case.

If you agree with this, I can directly fix the commit message when
applying the patch.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.