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Re: [PATCH] xen:add deviations for MISRA C 2012 Rule R5.2
- To: alessandro.zucchelli@xxxxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 13 Nov 2024 11:54:30 +0100
- Autocrypt: addr=jbeulich@xxxxxxxx; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL
- Cc: consulting@xxxxxxxxxxx, Simone Ballarin <simone.ballarin@xxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>
- Delivery-date: Wed, 13 Nov 2024 10:54:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.11.2024 11:48, Alessandro Zucchelli wrote:
> At this link you can see all the violations of Rule 5.2:
>
> https://saas.eclairit.com:3787/fs/var/local/eclair/xen-project.ecdf/xen-project/people/bugseng/xen/ECLAIR_normal/40_characters/X86_64/8143097084/PROJECT.ecd;/by_service/MC3R1.R5.2.html
Thank you. From a cursory look these all appear to be a result of the 40
chars limit we put in place (quite arbitrarily). That's not mentioned at
all ...
> By deviating the two macros CHECK_NAME_ and DEFINE_COMPAT_HANDLE all the
> violations are addressed.
>
> On 2024-11-13 11:31, Jan Beulich wrote:
>> On 13.11.2024 09:41, Alessandro Zucchelli wrote:
>>> This addresses violations of MISRA C:2012 Rule 5.2 which states as
>>> following: Identifiers declared in the same scope and name space shall
>>> be distinct.
>>>
>>> This deviation addresses violations of Rule 5.2 arising from
>>> identifiers generated through token pasting macros CHECK_NAME_ and
>>> DEFINE_COMPAT_HANDLE.
... in the description.
Together with the 5.4 patch having the same lack of context, I wonder
whether we shouldn't simply up that limit. Or else, as suggested there,
to instead exclude such derived identifiers. After all the derived ones
will be distinct as long as what they're derived from is distinct.
Finally - please don't top-post.
Jan
>> For each of the two, can you provide an example of where collisions
>> result? At least for the latter I can't even see how that would
>> work without the compiler complaining (i.e. the build breaking).
>>
>> Jan
>
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