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Re: [PATCH] generic/altp2m: address violations of MISRA C Rule 2.1
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 10 Apr 2026 08:04:03 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 10 Apr 2026 06:04:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 09.04.2026 19:37, Dmytro Prokopchuk1 wrote:
> MISRA C Rule 2.1 states: "A project shall not contain unreachable code".
>
> In certain build configurations,
Can you give an example where ...
> the function 'altp2m_vcpu_idx()' is defined
> as an inline function that contains the 'BUG()' macro. This resulted in a
> violation because the 'BUG()' macro makes the function non-returning.
>
> To ensure compliance with MISRA C Rule 2.1, this patch removes the inline
> function implementation and its BUG()-based unreachable code. It is replaced
> with an unconditional function declaration for 'altp2m_vcpu_idx()'.
... a declaration is needed? The sole non-x86 reference I see is from
common/monitor.c, and the sole relevant Kconfig option I can spot is
VM_EVENT. When that's off, the file won't be built at all.
Further, BUG() and a few more constructs have a dedicated deviation
already in place. I don't mind a useless function to be shrunk (or, as
per above, perhaps even dropped), but the justification then needs to
be different.
Jan
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