linux-kernel - Re: [PATCH RFC 03/15] KVM: Add build-time error check on kvm

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Message-ID: <ee107756-12d2-2de0-bb05-a23616346b6d@redhat.com>
Date:   Tue, 3 Dec 2019 14:41:58 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Peter Xu <peterx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH RFC 03/15] KVM: Add build-time error check on kvm_run size

On 02/12/19 23:19, Sean Christopherson wrote:
>>> e.g. in a mostly hypothetical case where the allocation of vcpu->run
>>> were changed to something else.
>> And that's why I added BUILD_BUG_ON right beneath that allocation. :)

It's not exactly beneath it (it's out of the patch context at least).  I
think a comment is not strictly necessary, but a better commit message
is and, since you are at it, I would put the BUILD_BUG_ON *before* the
allocation.  That makes it more obvious that you are checking the
invariant before allocating.

Paolo