[libvirt] [PATCH 1/2] qemu: Invert condition nesting in qemuDomainDefValidate()

[Peter Krempa]

On Fri, Dec 15, 2017 at 14:11:41 +0100, Andrea Bolognani wrote:
> On Fri, 2017-12-15 at 13:18 +0100, Peter Krempa wrote:
> > On Thu, Dec 14, 2017 at 17:29:50 +0100, Andrea Bolognani wrote:
> > > While at the moment we're only performing a single check that is
> > > connected to vCPU hotplugging, we're going to introduce a second
> > > one soon. Move the topology check underneath the capability check
> > > to make that easier; as a bonus, doing so allows us to reduce the
> > > scope of the 'topologycpus' variable.
> > 
> > You know that generally we prefer variables declared at the top scope?
> 
> Is that so? I've seen several instances of the opposite, and it
> makes to me not to pollute the function scope with one-use
> variables when there are usually enough variables that actually
> need to be accessed throughout the function. But I can leave the
> declaration where it is if you like it better that way.

Fair enough. We only state that we should declare it at the beginning of
a scope, so while generally most are declared at function scoep, this
does not violate the contributor guidelines.

> 
> > Also you change the version of qemu in the comment without explanation
> > here. Rather than bragging how you reduced scope, please document that
> > change.
> 
> Right, I meant to include the explanation but forgot :)
> 
> It's very simple, anyway: the version number was wrong, since
> QEMU introduced query-hotpluggable-cpus in 2.7 rather than 2.5.

While this is true for the presence of query-hotpluggable-cpus. The
paragraph is specifically saying that QEMU rejects such configurations
starting from 2.5., but the code checks them only since
query-hotpluggable-cpus (which was introduced in 2.7).

Your modification is thus incorrect. You can add statement that
query-hotpluggable-cpus was added in 2.7. but mangling it as you did is
not correct in my opinion.
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