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Re: [XEN PATCH 01/10] xen/include: address violations of MISRA C Rule 20.7
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 29 Feb 2024 16:47:41 +0000
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, jbeulich@xxxxxxxx, roger.pau@xxxxxxxxxx, bertrand.marquis@xxxxxxx, julien@xxxxxxx, George Dunlap <george.dunlap@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Thu, 29 Feb 2024 16:47:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29/02/2024 4:21 pm, Nicola Vetrini wrote:
> On 2024-02-29 17:10, Andrew Cooper wrote:
>> On 29/02/2024 3:27 pm, Nicola Vetrini wrote:
>>> diff --git a/xen/include/xen/kconfig.h b/xen/include/xen/kconfig.h
>>> index c25dc0f6c2a9..b7e70289737b 100644
>>> --- a/xen/include/xen/kconfig.h
>>> +++ b/xen/include/xen/kconfig.h
>>> @@ -25,7 +25,7 @@
>>> #define __ARG_PLACEHOLDER_1 0,
>>> #define config_enabled(cfg) _config_enabled(cfg)
>>> #define _config_enabled(value)
>>> __config_enabled(__ARG_PLACEHOLDER_##value)
>>> -#define __config_enabled(arg1_or_junk)
>>> ___config_enabled(arg1_or_junk 1, 0)
>>> +#define __config_enabled(arg1_or_junk)
>>> ___config_enabled(arg1_or_junk (1), (0))
>>> #define ___config_enabled(__ignored, val, ...) val
>>
>> This one hunk I suggest we deviate rather than adjust. You've subtly
>> broken it, and it's extreme preprocessor magic in the first place to
>> turn an absent symbol into a 0.
>>
>
> How so? I did test this because I was very wary of it, but it seemed
> to expand fine (either if ((0)) or if ((1)) ). I may of course be
> wrong, and it could be deviated regardless.
>
arg1_or_junk(1) can now be a function or macro expansion depending on
context, where previously it couldn't be.
~Andrew
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