linux-kernel - Re: [PATCH] ALSA: hda: fix SND_INTEL_DSP

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Date:   Tue, 5 Jan 2021 14:30:05 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Jaroslav Kysela <perex@...ex.cz>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        ALSA Development Mailing List <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        sound-open-firmware@...a-project.org
Subject: Re: [PATCH] ALSA: hda: fix SND_INTEL_DSP_CONFIG dependency

On Mon, Jan 4, 2021 at 4:00 PM Jaroslav Kysela <perex@...ex.cz> wrote:
> Dne 03. 01. 21 v 14:52 Arnd Bergmann napsal(a):

> > diff --git a/include/sound/intel-dsp-config.h b/include/sound/intel-dsp-config.h
> > index d4609077c258..94667e870029 100644
> > --- a/include/sound/intel-dsp-config.h
> > +++ b/include/sound/intel-dsp-config.h
> > @@ -18,24 +18,7 @@ enum {
> >       SND_INTEL_DSP_DRIVER_LAST = SND_INTEL_DSP_DRIVER_SOF
> >  };
> >
> > -#if IS_ENABLED(CONFIG_SND_INTEL_DSP_CONFIG)
>
> The SOF drivers selects the DSP config code only when required (for specific
> platforms - see sound/soc/sof/intel/Kconfig).
>
> It seems that the above if should be modified as:
>
> #if IS_BUILDIN(CONFIG_SND_INTEL_DSP_CONFIG) || (defined(MODULE) &&
> IS_MODULE(CONFIG_SND_INTEL_DSP_CONFIG))
>
> So the buildin drivers which do not require the DSP config probe can be
> compiled without this dependency.

This would be the same as

#if IS_REACHABLE(CONFIG_SND_INTEL_DSP_CONFIG)

but using that macro is almost always a bad idea, as it tends to hide
dependency problems and causes things to silently not work right
when the Kconfig rules are incorrect.

      Arnd