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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: Mon, 18 May 2026 11:48:50 +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: Mon, 18 May 2026 09:49:07 +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:
>> ... ("Conversions shall not be performed between a pointer to an
>> incomplete type and any other type"): Add an intermediate cat to void *.
>
> cast
>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> https://gitlab.com/xen-project/hardware/xen-staging/-/jobs/14351897188
>> (covering more than just this)
>>
>> --- 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.
>
> But, can't we just cast through unsigned long instead? The compiler is
> happy, and that feels safer than using a pointer type.
As per https://gitlab.com/xen-project/hardware/xen-staging/-/jobs/14416863057
that doesn't work.
Jan
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