linux-kernel - RE: [PATCH V5 1/9] drivers core: Add support for Wifi band RF mitigations

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Message-ID: <DM6PR12MB2619CD9C8583B4A15AE18968E42EA@DM6PR12MB2619.namprd12.prod.outlook.com>
Date:   Tue, 4 Jul 2023 03:25:23 +0000
From:   "Quan, Evan" <Evan.Quan@....com>
To:     Andrew Lunn <andrew@...n.ch>,
        "Limonciello, Mario" <Mario.Limonciello@....com>
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        "lenb@...nel.org" <lenb@...nel.org>,
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Subject: RE: [PATCH V5 1/9] drivers core: Add support for Wifi band RF
 mitigations

[AMD Official Use Only - General]

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Saturday, July 1, 2023 8:25 AM
> To: Limonciello, Mario <Mario.Limonciello@....com>
> Cc: Quan, Evan <Evan.Quan@....com>; rafael@...nel.org; lenb@...nel.org;
> Deucher, Alexander <Alexander.Deucher@....com>; Koenig, Christian
> <Christian.Koenig@....com>; Pan, Xinhui <Xinhui.Pan@....com>;
> airlied@...il.com; daniel@...ll.ch; johannes@...solutions.net;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; mdaenzer@...hat.com;
> maarten.lankhorst@...ux.intel.com; tzimmermann@...e.de;
> hdegoede@...hat.com; jingyuwang_vip@....com; Lazar, Lijo
> <Lijo.Lazar@....com>; jim.cromie@...il.com; bellosilicio@...il.com;
> andrealmeid@...lia.com; trix@...hat.com; jsg@....id.au; arnd@...db.de;
> linux-kernel@...r.kernel.org; linux-acpi@...r.kernel.org; amd-
> gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-
> wireless@...r.kernel.org; netdev@...r.kernel.org
> Subject: Re: [PATCH V5 1/9] drivers core: Add support for Wifi band RF
> mitigations
>
> > Right now there are stubs for non CONFIG_WBRF as well as other patches
> > are using #ifdef CONFIG_WBRF or having their own stubs.  Like mac80211
> > patch looks for #ifdef CONFIG_WBRF.
> >
> > I think we should pick one or the other.
> >
> > Having other subsystems #ifdef CONFIG_WBRF will make the series easier
> > to land through multiple trees; so I have a slight leaning in that direction.
>
> #ifdef in C files is generally not liked because it makes build testing harder.
> There are more permutations to build. It is better to use
>
> if (IS_ENABLED(CONFIG_WBTR)) {
> }
>
> so that the code is compiled, and them throw away because
> IS_ENABLED(CONFIG_WBTR) evaluates to false.
>
> However, if the stubs are done correctly, the driver should not care. I doubt
> this is used in any sort of hot path where every instruction counts.
OK, will update as suggested.

Evan
>
>       Andrew