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Re: [XEN PATCH 1/5] xen/domain: deviate violation of MISRA C Rule 20.12
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 3 Jun 2024 08:39:02 +0200
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 03 Jun 2024 06:39:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.06.2024 12:16, Nicola Vetrini wrote:
> MISRA C Rule 20.12 states: "A macro parameter used as an operand to
> the # or ## operators, which is itself subject to further macro replacement,
> shall only be used as an operand to these operators".
>
> In this case, builds where CONFIG_DEBUG_LOCK_PROFILE=y the domain_lock
> macro is used both as a regular macro argument and as an operand for
> stringification in the expansion of macro spin_lock_init_prof.
The shouldn't the marker be on the definition of spin_lock_init_prof(),
rather than ...
> --- a/xen/common/domain.c
> +++ b/xen/common/domain.c
> @@ -632,6 +632,7 @@ struct domain *domain_create(domid_t domid,
>
> atomic_set(&d->refcnt, 1);
> RCU_READ_LOCK_INIT(&d->rcu_lock);
> + /* SAF-6-safe Rule 20.12 expansion of macro domain_lock in debug builds
> */
> rspin_lock_init_prof(d, domain_lock);
> rspin_lock_init_prof(d, page_alloc_lock);
> spin_lock_init(&d->hypercall_deadlock_mutex);
... actually just one of the two uses here (and presumably several more
elsewhere)?
Jan
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