linux-kernel - Re: [RFC PATCH 1/2] bitops: add generic parity calculation for u8

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Message-ID: <CAMuHMdVZ6_LCZcPiL59A05XkNt88-2OwDTHZDdT0c7GMuFQNag@mail.gmail.com>
Date: Mon, 16 Dec 2024 10:49:06 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hwmon@...r.kernel.org, Yury Norov <yury.norov@...il.com>, 
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [RFC PATCH 1/2] bitops: add generic parity calculation for u8

On Sat, Dec 14, 2024 at 9:59 AM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> There are multiple open coded implementations for getting the parity of
> a byte in the kernel, even using different approaches. Take the pretty
> efficient version from SPD5118 driver and make it generally available by
> putting it into the bitops header. As long as there is just one parity
> calculation helper, the creation of a distinct 'parity.h' header was
> discarded. Also, the usage of hweight8() for architectures having a
> popcnt instruction is postponed until a use case within hot paths is
> desired. The motivation for this patch is the frequent use of odd parity
> in the I3C specification and to simplify drivers there.
>
> Changes compared to the original SPD5118 version are the addition of
> kernel documentation, switching the return type from bool to int, and
> renaming the argument of the function.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds