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Re: [PATCH v9 03/15] xen/bitops: implement fls{l}() in common logic
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 15 May 2024 11:09:21 +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 09:09:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
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?
(replying out of order)
> --- a/xen/arch/arm/include/asm/arm32/bitops.h
> +++ b/xen/arch/arm/include/asm/arm32/bitops.h
> @@ -1,7 +1,7 @@
> #ifndef _ARM_ARM32_BITOPS_H
> #define _ARM_ARM32_BITOPS_H
>
> -#define flsl fls
> +#define arch_flsl fls
It's the Arm maintainers to ultimately judge, but I'd be inclined to suggest
#define arch_flsl arch_fls
instead. That's not only behaviorally closer to what was there before, but
also reduces (a tiny bit) the amount of work the compiler needs to carry out.
Jan
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