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Re: [PATCH v9 03/15] xen/bitops: implement fls{l}() in common logic
- To: "Oleksii K." <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 15 May 2024 16:07:18 +0200
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- Cc: 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: Wed, 15 May 2024 14:07:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.05.2024 15:55, Oleksii K. wrote:
> On Wed, 2024-05-15 at 11:09 +0200, Jan Beulich wrote:
>> On 06.05.2024 12:15, Oleksii Kurochko wrote:
>>> Changes in V9:
>>> - update return type of fls and flsl() to unsigned int to be
>>> aligned with other
>>> bit ops.
>>
>> But this then needs carrying through to ...
>>
>>> --- a/xen/arch/arm/include/asm/arm64/bitops.h
>>> +++ b/xen/arch/arm/include/asm/arm64/bitops.h
>>> @@ -22,17 +22,15 @@ static /*__*/always_inline unsigned long
>>> __ffs(unsigned long word)
>>> */
>>> #define ffz(x) __ffs(~(x))
>>>
>>> -static inline int flsl(unsigned long x)
>>> +static inline int arch_flsl(unsigned long x)
>>
>> ... e.g. here. You don't want to introduce signed/unsigned
>> mismatches.
> Do you mean that generic flsl() uses 'unsigned int' as a return type,
> but arch_flsl continue to use 'int'?
Yes.
>> Also why do you keep "inline" here, while ...
>>
>>> --- a/xen/arch/x86/include/asm/bitops.h
>>> +++ b/xen/arch/x86/include/asm/bitops.h
>>> @@ -425,7 +425,7 @@ static always_inline unsigned int
>>> arch_ffsl(unsigned long x)
>>> *
>>> * This is defined the same way as ffs.
>>> */
>>> -static inline int flsl(unsigned long x)
>>> +static always_inline int arch_flsl(unsigned long x)
>>
>> ... you switch to always_inline here?
> Because Adnrew's patch with bitops.h for x86 changes to always_inline,
> so to be consistent, at least, for architecture.
And why not extend this to Arm?
Jan
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