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Re: [PATCH v4 09/30] xen/riscv: introduce bitops.h
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 13 Feb 2024 10:19:17 +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: Tue, 13 Feb 2024 09:19:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.02.2024 16:32, Oleksii Kurochko wrote:
> --- a/xen/arch/riscv/include/asm/config.h
> +++ b/xen/arch/riscv/include/asm/config.h
> @@ -50,6 +50,8 @@
> # error "Unsupported RISCV variant"
> #endif
>
> +#define BITS_PER_BYTE 8
> +
> #define BYTES_PER_LONG (1 << LONG_BYTEORDER)
> #define BITS_PER_LONG (BYTES_PER_LONG << 3)
> #define POINTER_ALIGN BYTES_PER_LONG
How does this change relate to this patch? I can't see the new symbol
being used anywhere.
> --- /dev/null
> +++ b/xen/include/asm-generic/bitops/__ffs.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_GENERIC_BITOPS___FFS_H_
> +#define _ASM_GENERIC_BITOPS___FFS_H_
> +
> +/**
> + * ffs - find first bit in word.
__ffs ? Or wait, ...
> + * @word: The word to search
> + *
> + * Returns 0 if no bit exists, otherwise returns 1-indexed bit location.
... this actually describes ffs(), not __ffs(), and the implementation
doesn't match the description. The correct description for this function
(as Linux also has it)
* Undefined if no bit exists, so code should check against 0 first.
Which raises a question regarding "Taken from Linux-6.4.0-rc1" in the
description. ffs.h pretty clearly also doesn't come from there.
I first I thought I might withdraw my earlier request to split all of
this up. But with just these two observations I now feel it's even
more important that you do, so every piece can be properly attributed
to (and then checked for) its origin.
Jan
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