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Re: [PATCH v3] misra: consider conversion from UL or (void*) to function pointer as safe
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 15 Oct 2025 08:20:00 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, 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>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 15 Oct 2025 06:20:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.10.2025 18:16, Dmytro Prokopchuk1 wrote:
> --- a/xen/common/version.c
> +++ b/xen/common/version.c
> @@ -217,6 +217,20 @@ void __init xen_build_init(void)
> #endif /* CONFIG_X86 */
> }
> #endif /* BUILD_ID */
> +
> +#if defined(__i386__) || defined(__x86_64__) || defined(__arm__) ||
> defined(__aarch64__)
Why __i386__? Also (nit): Line too long.
And why this restriction without any comment here or ...
> +static void __init __maybe_unused build_assertions(void)
> +{
> + /*
> + * To confirm conversion compatibility between unsigned long, (void *)
> + * and function pointers for X86 and ARM architectures only.
... explanation here? More generally - how would people know to update
the condition if another port was to be certified?
Finally, with the v3 addition here, is Nicola's R-b really still applicable?
Jan
> + */
> +
> + BUILD_BUG_ON(sizeof(unsigned long) != sizeof(void (*)(void)));
> + BUILD_BUG_ON(sizeof(void *) != sizeof(void (*)(void)));
> +}
> +#endif
> +
> /*
> * Local variables:
> * mode: C
|
