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Re: [XEN PATCH 5/5] xen/wait: address violations of MISRA C Rule 11.9
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 19 Dec 2023 11:48:19 +0100
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- Cc: consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 19 Dec 2023 10:48:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.12.2023 12:44, Nicola Vetrini wrote:
> No functional change.
>
> Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Nevertheless, imo ...
> --- a/xen/common/wait.c
> +++ b/xen/common/wait.c
> @@ -125,7 +125,7 @@ static void __prepare_to_wait(struct waitqueue_vcpu *wqv)
> struct vcpu *curr = current;
> unsigned long dummy;
>
> - ASSERT(wqv->esp == 0);
> + ASSERT(wqv->esp == NULL);
>
> /* Save current VCPU affinity; force wakeup on *this* CPU only. */
> if ( vcpu_temporary_affinity(curr, smp_processor_id(),
> VCPU_AFFINITY_WAIT) )
> @@ -171,7 +171,7 @@ static void __prepare_to_wait(struct waitqueue_vcpu *wqv)
> [sz] "i" (PAGE_SIZE)
> : "memory", "rax", "rdx", "r8", "r9", "r10", "r11" );
>
> - if ( unlikely(wqv->esp == 0) )
> + if ( unlikely(wqv->esp == NULL) )
> {
> gdprintk(XENLOG_ERR, "Stack too large in %s\n", __func__);
> domain_crash(curr->domain);
... in both cases the better change (more in line with what we do elsewhere,
even if not liked by Misra and hence being deviated by us) would have been
to use ! in place of == NULL.
Jan
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