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Re: [PATCH v7 04/19] xen: introduce generic non-atomic test_*bit()
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 5 Apr 2024 08:11:27 +0200
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- Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 05 Apr 2024 06:11:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.04.2024 18:24, Oleksii wrote:
> On Thu, 2024-04-04 at 18:12 +0200, Jan Beulich wrote:
>> On 04.04.2024 17:45, Oleksii wrote:
>>> On Thu, 2024-04-04 at 15:22 +0200, Jan Beulich wrote:
>>>> On 03.04.2024 12:19, Oleksii Kurochko wrote:
>>>>> --- a/xen/include/xen/bitops.h
>>>>> +++ b/xen/include/xen/bitops.h
>>>>> @@ -65,10 +65,164 @@ static inline int generic_flsl(unsigned
>>>>> long
>>>>> x)
>>>>> * scope
>>>>> */
>>>>>
>>>>> +#define BITOP_BITS_PER_WORD 32
>>>>> +/* typedef uint32_t bitop_uint_t; */
>>>>> +#define bitop_uint_t uint32_t
>>>>
>>>> So no arch overrides permitted anymore at all?
>>> Not really, I agree that it is ugly, but I expected that arch will
>>> use
>>> undef to override.
>>
>> Which would be fine in principle, just that Misra wants us to avoid
>> #undef-s
>> (iirc).
> Could you please give me a recommendation how to do that better?
>
> The reason why I put this defintions before inclusion of asm/bitops.h
> as RISC-V specific code uses these definitions inside it, so they
> should be defined before asm/bitops.h; other option is to define these
> definitions inside asm/bitops.h for each architecture.
Earlier on you had it that other way already (in a different header,
but the principle is the same): Move the generic definitions immediately
past inclusion of asm/bitops.h and frame them with #ifndef.
Jan
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