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Re: [PATCH v5 04/23] xen/asm-generic: introduce generic fls() and flsl() functions
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 29 Feb 2024 16:52:18 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 29 Feb 2024 15:52:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.02.2024 18:38, Oleksii Kurochko wrote:
> --- /dev/null
> +++ b/xen/include/asm-generic/bitops/fls.h
> @@ -0,0 +1,18 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_GENERIC_BITOPS_FLS_H_
> +#define _ASM_GENERIC_BITOPS_FLS_H_
> +
> +/**
> + * fls - find last (most-significant) bit set
> + * @x: the word to search
> + *
> + * This is defined the same way as ffs.
> + * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
> + */
> +
> +static inline int fls(unsigned int x)
> +{
> + return generic_fls(x);
> +}
This being an inline function, it requires generic_fls() to be declared.
Yet there's no other header included here. I think these headers would
better be self-contained. Or else (e.g. because of this leading to an
#include cycle) something needs saying somewhere.
The other thing here that worries me is the use of plain int as return
type. Yes, generic_fls() is declared like that, too. But no, the return
value there or here cannot be negative.
Jan
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