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Re: [PATCH] x86/shim: adjust for Misra C:2012 rule 20.12
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 13 May 2026 17:30:36 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Wed, 13 May 2026 16:30:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13/05/2026 4:52 pm, Jan Beulich wrote:
> ... ("A macro parameter used as an operand to the `#' or `##' operators,
> which is itself subject to further macro replacement, shall only be used
> as an operand to these operators"). Move the HVM_PARAM_ prefixes into the
> macro body, to use ## on the 2nd use (each) of the macro parameter.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> I understand that this "absorbing" of prefixes isn't liked by some people,
> so I'm all ears towards alternative suggestions.
>
> https://gitlab.com/xen-project/hardware/xen-staging/-/jobs/14354119193
> (also covering the 17.5 patch)
Yeah, I'm a firm -1 to absorbing the prefixes. This is simple
obfuscation just to hide it from Eclair's eyes.
The ARM folks fixed this by using a SAF-6 annotation. e.g. 195d754170891
Although honestly, the more I think about this, the more I think we
should just globally deviate. I don't consider the concept having a
well-named constant be used both as a value and a string a confusing thing.
~Andrew
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