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Re: [PATCH] Arm: rename smp_clear_cpu_maps()
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 17 Apr 2025 11:14:04 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, consulting@xxxxxxxxxxx
- Delivery-date: Thu, 17 Apr 2025 09:14:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.04.2025 10:48, Nicola Vetrini wrote:
> On 2025-04-17 10:36, Jan Beulich wrote:
>> The function has lost all clearing operations. Use the commonly
>> available name (declared in xen/smp.h), that x86 also uses.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> I would have expected this to also address a Misra violation
>> (declaration without definition), but I can't spot any rule (having
>> looked through 8.x in particular) to this effect.
>
> The rule you are looking for is 8.6: " An identifier with external
> linkage shall have exactly one external definition", which is explicitly
> deviated in Xen to allow declarations that have no definition,
> especially in the case where definitions may be optimized out by the
> compiler or are simply compiled out. I don't recall the specific
> discussion that led to this deviation, but I can dug it up, if needed.
The respective deviation is imo bogus. Iirc if anything this is about
DCE, which isn't "definition is compiled-out or optimized-out by the
compiler" but "invocation is compiled-out or optimized-out by the
compiler": If the definition was optimized out, there necessarily _is_
a definition in source.
Jan
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