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Re: [Xen-devel] [PATCH v2] CODING_STYLE: document intended usage of types


  • To: George Dunlap <george.dunlap@xxxxxxxxxx>
  • From: Jan Beulich <JBeulich@xxxxxxxx>
  • Date: Mon, 5 Aug 2019 11:55:23 +0000
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 05 Aug 2019 11:56:05 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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  • Thread-topic: [PATCH v2] CODING_STYLE: document intended usage of types

On 05.08.2019 12:58, George Dunlap wrote:
> On 11/26/18 9:31 AM, Jan Beulich wrote:
>> +Fixed width types should only be used when a fixed width quantity is
>> +meant (which for example may be a value read from or to be written to a
>> +register).
> 
> I'm having trouble understanding the intent / implications of this one.
>   Can you give me an example of where you've seen a fixed width type used
> inappropriately?

Grep the code base for "uint32_t size" for example. These should
(almost?) all be unsigned int (or, where necessary, size_t). And
while there is uint_least32_t I think we should prefer
unsigned int for such purposes, as we expect this type to have
at least 32 significant bits anyway.

Jan
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