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Re: [PATCH] x86/MCE: adjust ID2COOKIE() for Misra C:2012 rule 11.2
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 15 May 2026 08:26:22 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 15 May 2026 06:26:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.05.2026 19:00, Andrew Cooper wrote:
> On 13/05/2026 3:03 pm, Jan Beulich wrote:
>> --- a/xen/arch/x86/cpu/mcheck/mce.c
>> +++ b/xen/arch/x86/cpu/mcheck/mce.c
>> @@ -1264,7 +1264,7 @@ static void cf_check __maybe_unused x86_
>>
>> #if BITS_PER_LONG == 64
>>
>> -#define ID2COOKIE(id) ((mctelem_cookie_t)(id))
>> +#define ID2COOKIE(id) ((mctelem_cookie_t)(void *)(id))
>
> The interface here is horrible, because we're passing a pointer to a
> uint64_t to userspace and back.
Indeed.
> But, can't we just cast through unsigned long instead? The compiler is
> happy, and that feels safer than using a pointer type.
I can check if that also helps. Casting to void * let's us, aiui, get away
without leveraging any custom deviations that we have.
Jan
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