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Re: [PATCH v4] misra: allow discarding 'noreturn' during conversions
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 1 Aug 2025 12:53:43 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, 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>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 01 Aug 2025 10:54:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.08.2025 12:48, Dmytro Prokopchuk1 wrote:
> The conversion from a function pointer with the 'noreturn' attribute
> ('void noreturn (*)(...)') to a function pointer type ('void (*)(...)'
> causes type incompatibility according to MISRA C Rule 11.1, which
> forbids conversions between incompatible function pointer types.
This wider deviation ...
> The violation occurs at the call site:
> smp_call_function(halt_this_cpu, NULL, 0);
> where 'halt_this_cpu' with type 'void noreturn (*)(void *)' is passed to
> 'smp_call_function' expecting function pointer of type 'void (*)(void *)'.
>
> The 'noreturn' attribute does not change the function calling convention
> or parameter handling at runtime, making the conversion safe.
>
> Configure ECLAIR to treat implicit conversions that lose the "noreturn"
> attribute on a function 'void (*)(void*)' as safe.
... wants connecting to this more narrow Eclair configuration. That's what
I meant when I said "description also suitably adjusted". For example, the
last sentence above could start "For now, configure Eclair to just treat
...". Can adjust when committing, assuming an ack for the .ecl change
appears.
> Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx> # docs
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