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Re: [PATCH 3/5] AMD/IOMMU: address violations of MISRA C:2012 Rule 11.8
- To: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 24 Nov 2023 17:53:45 +0000
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- Cc: consulting@xxxxxxxxxxx, maria.celeste.cesario@xxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Fri, 24 Nov 2023 17:53:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24/11/2023 4:29 pm, Simone Ballarin wrote:
> From: Maria Celeste Cesario <maria.celeste.cesario@xxxxxxxxxxx>
>
> Add missing const qualifier in casting to comply with Rule 11.8.
> The type of the formal parameter ivhd_block is const qualified.
> No functional change.
>
> Signed-off-by: Maria Celeste Cesario <maria.celeste.cesario@xxxxxxxxxxx>
> Signed-off-by: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>
> ---
> xen/drivers/passthrough/amd/iommu_acpi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c
> b/xen/drivers/passthrough/amd/iommu_acpi.c
> index 699d33f429..00923a6bb5 100644
> --- a/xen/drivers/passthrough/amd/iommu_acpi.c
> +++ b/xen/drivers/passthrough/amd/iommu_acpi.c
> @@ -1232,7 +1232,7 @@ static int __init get_last_bdf_ivhd(
> while ( ivhd_block->header.length >=
> (block_length + sizeof(struct acpi_ivrs_de_header)) )
> {
> - ivhd_device = (const void *)((u8 *)ivhd_block + block_length);
> + ivhd_device = (const void *)((const uint8_t *)ivhd_block +
> block_length);
This we should simplify into just:
ivhd_device = (const void *)ivhd_block + block_length;
We use this GCC extension in many other places too.
~Andrew
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