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Re: [PATCH v3 10/34] xen/riscv: introduce bitops.h
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 19 Jan 2024 10:14:50 +0100
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, 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: Fri, 19 Jan 2024 09:15:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.01.2024 10:09, Oleksii wrote:
> On Thu, 2024-01-18 at 12:03 +0100, Jan Beulich wrote:
>> On 22.12.2023 16:12, Oleksii Kurochko wrote:
>>> --- /dev/null
>>> +++ b/xen/include/asm-generic/bitops/bitops-bits.h
>>> @@ -0,0 +1,10 @@
>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>> +#ifndef _ASM_GENERIC_BITOPS_BITS_H_
>>> +#define _ASM_GENERIC_BITOPS_BITS_H_
>>> +
>>> +#define BITOP_BITS_PER_WORD 32
>>> +#define BITOP_MASK(nr) (1UL << ((nr) %
>>> BITOP_BITS_PER_WORD))
>>> +#define BITOP_WORD(nr) ((nr) / BITOP_BITS_PER_WORD)
>>> +#define BITS_PER_BYTE 8
>>
>> Btw, I can't spot a use of BITS_PER_BYTE. Why do you add it? And if
>> it really needed adding, it surely wouldn't belong here.
> It is used in common/bitmap.c and ns16550.c, and inside some arch code,
> but it is not used by RISC-V right now.
>
> Would it be better to define it in config.h?
Yes, perhaps. Imo this shouldn't have a "generic" fallback; every arch
should explicitly state this (along with e.g. BITS_PER_LONG).
Jan
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