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Re: [PATCH 2/4] xen/arm: acpi: resolve MISRA C Rule 11.8 in acpi_xsdt_modify_entry()
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 3 Nov 2026 11:34:59 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 03 Nov 2026 10:35:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.11.2026 11:29, Dmytro Prokopchuk1 wrote:
> ACPI_COMPARE_NAME() casts both of its arguments to 'u32 *' through
> ACPI_CAST_PTR(). The 'signature' argument of acpi_xsdt_modify_entry()
> is 'const char *', so the macro casts away its const-ness, which is
> a violation of MISRA C Rule 11.8.
>
> Use strncmp() with ACPI_NAME_SIZE instead. It takes 'const char *'
> arguments, so no cast is needed at all. It also avoids reading a 'u32'
> through a possibly unaligned char pointer.
>
> No functional changes.
>
> Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
Worth mentioning perhaps that this (apparently) is an alternative to
https://lists.xen.org/archives/html/xen-devel/2026-09/msg00044.html.
Jan
> --- a/xen/arch/arm/acpi/domain_build.c
> +++ b/xen/arch/arm/acpi/domain_build.c
> @@ -253,7 +253,7 @@ static void __init acpi_xsdt_modify_entry(u64 entry[],
> for( i = 0; i < entry_count; i++ )
> {
> table = acpi_os_map_memory(entry[i], size);
> - if ( ACPI_COMPARE_NAME(table->signature, signature) )
> + if ( !strncmp(table->signature, signature, ACPI_NAME_SIZE) )
> {
> entry[i] = addr;
> acpi_os_unmap_memory(table, size);
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