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Re: [PATCH v2 1/2] xen/page_alloc: address violation of Rule 14.3
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 12 May 2025 14:07:37 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Victor Lira <victorm.lira@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Federico Serafini <federico.serafini@xxxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 12 May 2025 12:07:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.05.2025 01:28, Stefano Stabellini wrote:
> From: Federico Serafini <federico.serafini@xxxxxxxxxxx>
>
> MISRA C Rule 14.3 states that "Controlling expressions shall not be
> invariant".
>
> Change the #define to static inline to resolve the violation.
>
> Signed-off-by: Federico Serafini <federico.serafini@xxxxxxxxxxx>
> Signed-off-by: Victor Lira <victorm.lira@xxxxxxx>
>
> diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
> index bd4538c28d..9ee1506703 100644
> --- a/xen/common/page_alloc.c
> +++ b/xen/common/page_alloc.c
> @@ -2005,7 +2005,10 @@ static unsigned long __initdata buddy_alloc_size =
> MB(CONFIG_BUDDY_ALLOCATOR_SIZE);
> size_param("buddy-alloc-size", buddy_alloc_size);
> #else
> -#define domain_num_llc_colors(d) 0
> +static inline unsigned int domain_num_llc_colors(const struct domain *d)
> +{
> + return 0;
> +}
Isn't this merely pleasing Eclair without actually addressing the violation?
The spec's last example is, I think, a good demonstration (sadly the PDF
doesn't allow copy-out). The violation described there, with a loop
calculating a value ahead of the actual if(), is even less obviously one
than the inline function here.
Jan
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