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Re: [PATCH] x86: calculate number of synthetic feature and bug enumerators
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 2 Feb 2026 15:56:41 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 02 Feb 2026 16:01:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19/01/2026 3:30 pm, Jan Beulich wrote:
> Rather than spelling out their amounts (requiring updates when multiples
> of 32 are crossed), introduce a sentinel each and calculate the two
> numbers from those.
>
> No difference in generated code, albeit debug info size grows quite a bit.
Presumably because of the substantial increase in preprocessed output?
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> This is an alternative to "x86: guard synthetic feature and bug
> enumerators", bulding upon the expectation that when adding to the end of
> either list people will notice the sentinel and not forget to update it.
The extra preprocessing overhead is not ideal, but it's certainly
preferable to the first version.
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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