linux-kernel - Re: [RFC PATCH v9 07/10] ice: add admin commands to access cgu configuration

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Message-ID: <CACRpkdar39x8nd5cWEDiFDHwLqHghUQZqkR0rEcv2-sZOZZ0KQ@mail.gmail.com>
Date:   Thu, 27 Jul 2023 23:16:42 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
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Subject: Re: [RFC PATCH v9 07/10] ice: add admin commands to access cgu configuration

Hi Arkadiusz,

On Fri, Jun 23, 2023 at 2:45 PM Arkadiusz Kubalewski
<arkadiusz.kubalewski@...el.com> wrote:

> +/**
> + * convert_s48_to_s64 - convert 48 bit value to 64 bit value
> + * @signed_48: signed 64 bit variable storing signed 48 bit value
> + *
> + * Convert signed 48 bit value to its 64 bit representation.
> + *
> + * Return: signed 64 bit representation of signed 48 bit value.
> + */
> +static s64 convert_s48_to_s64(s64 signed_48)
> +{
> +       return signed_48 & BIT_ULL(47) ?
> +               GENMASK_ULL(63, 48) | signed_48 : signed_48;
> +}

Can't you just use sign_extend64() from <linux/bitops.h>
passing bit 48 as sign bit istead of inventing this?

Yours,
Linus Walleij