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

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Message-ID: <DM6PR11MB465760932106C0719648B3FA9B06A@DM6PR11MB4657.namprd11.prod.outlook.com>
Date:   Fri, 28 Jul 2023 09:55:13 +0000
From:   "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
To:     Linus Walleij <linus.walleij@...aro.org>
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Subject: RE: [RFC PATCH v9 07/10] ice: add admin commands to access cgu
 configuration

>From: Linus Walleij <linus.walleij@...aro.org>
>Sent: Thursday, July 27, 2023 11:17 PM
>
>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?
>

Hi Linus,

First of all, sorry for late answer.
Well, Yes it seems I can :)
Thank you for pointing this out!
Arkadiusz

>Yours,
>Linus Walleij