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Re: [PATCH v2 2/4] x86/cpuid: Factor common parsing out of parse_xen_cpuid()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 16 Dec 2021 17:41:30 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 16 Dec 2021 16:41:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.12.2021 23:21, Andrew Cooper wrote:
> dom0-cpuid= is going to want to reuse the common parsing loop, so factor it
> out into parse_cpuid().
>
> Irritatingly, despite being static const, the features[] array gets duplicated
> each time parse_cpuid() is inlined. As it is a large (and ever growing with
> new CPU features) datastructure, move it to being file scope so all inlines
> use the same single object.
>
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> We probably want to be wary of fallout from this pattern elsewhere. I only
> noticed it by chance.
While that sounds at least close to a bug, there might by some subtle reason
for why they have to do it that way.
Jan
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