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Re: [XEN PATCH 2/5] iommu: address violation of MISRA C Rule 5.5
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 7 Jul 2025 10:10:46 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 07 Jul 2025 08:10:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.07.2025 22:39, Dmytro Prokopchuk1 wrote:
> Address a violation of MISRA C:2012 Rule 5.5:
> "Identifiers shall be distinct from macro names".
>
> Reports for service MC3A2.R5.5:
> xen/include/xen/iommu.h: non-compliant struct 'page_list_head'
> xen/include/xen/mm.h: non-compliant macro 'page_list_head'
What is this about? There's no code change that I could see which would
alter the situation here.
> xen/drivers/passthrough/iommu.c: non-compliant macro 'iommu_quarantine'
> xen/include/xen/iommu.h: non-compliant variable 'iommu_quarantine'
>
> These external variables ('iommu_pt_cleanup_lock'
> and 'iommu_pt_cleanup_list') are no longer used
> in the codebase. Removing them eliminates dead
> code and ensures compliance with coding standards.
> Fixes: b5622eb627 (iommu: remove unused iommu_ops method and tasklet,
> 2020-09-22)
That's a different Misra rule, so may better be put in a separate patch?
Otherwise please at least mention the rule number as well.
> The variable 'iommu_quarantine' makes sence to use
> only if 'CONFIG_HAS_PCI=y', so place it inside '#ifdef'.
Hmm, yes - not nice, but what do you do. I question "makes sense" though:
Quarantining is possible also without PCI, aiui. Just we don't that right
now.
Jan
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