Re: [kvm-unit-tests PATCH v2 2/6] lib: s390x: smp: refactor smp functions to accept indexes

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On 2/15/22 12:23, Claudio Imbrenda wrote:
On Tue, 15 Feb 2022 12:09:53 +0100
Steffen Eiden <seiden@xxxxxxxxxxxxx> wrote:

[...]

What about using the smp wrapper 'smp_sigp(idx, SIGP_RESTART, 0, NULL)'
here as well?

[...]

With my nits fixed:

maybe I should add a comment explaining why I did not use the smp_
variants.

the reason is that the smp_ variants check the validity of the CPU
index. but in those places, we have already checked (directly or
indirectly) that the index is valid, so I save one useless check.
> on the other hand, I don't know if it makes sense to optimize for that,
since it's not a hot path, and one extra check will not kill the
performance.

I would prefer the use of the smp_ variant. The extra assert won't clutter the output and the code is more consistent.
However, a short comment is also fine for me if you prefer that.



Reviewed-by: Steffen Eiden <seiden@xxxxxxxxxxxxx>




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