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

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Message-ID: <Z2ESttIzF4kX7JA-@shikoro>
Date: Tue, 17 Dec 2024 06:57:10 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Yury Norov <yury.norov@...il.com>
Cc: linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [RFC PATCH 1/2] bitops: add generic parity calculation for u8

On Mon, Dec 16, 2024 at 06:24:43PM -0800, Yury Norov wrote:
> On Sat, Dec 14, 2024 at 09:58:31AM +0100, Wolfram Sang 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>
> 
> Acked-by: Yury Norov <yury.norov@...il.com>

Cool, thank you!

> Would you like me to move this patch in bitmap-for-next?

I hope that both patches can be applied in one go to avoid a dependency.
I'd think the hwmon-tree is a tad more suitable, but I am also fine with
bitmap as long as both patches go in. What do you maintainers thing?


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