linux-kernel - Re: [RFC v2 31/39] sound: add HAS

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Date:   Mon, 9 May 2022 11:20:33 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>
Subject: Re: [RFC v2 31/39] sound: add HAS_IOPORT dependencies

On Mon, May 9, 2022 at 10:53 AM Takashi Iwai <tiwai@...e.de> wrote:
> On Fri, 29 Apr 2022 15:50:54 +0200, Niklas Schnelle wrote:

> >
> >  config SND_OPL3_LIB
> >       tristate
> > +     depends on HAS_IOPPORT
> >       select SND_TIMER
> >       select SND_HWDEP
> >       select SND_SEQ_DEVICE if SND_SEQUENCER != n
>
> Both of those are the items to be reverse-selected, so cannot fulfill
> the dependency with depends-on.  That is, the items that select those
> should have the dependency on HAS_IOPORT instead.
>
> That is, a change like below:
>
> > --- a/sound/isa/Kconfig
> > +++ b/sound/isa/Kconfig
> > @@ -31,7 +31,7 @@ if SND_ISA
> >
> >  config SND_ADLIB
> >       tristate "AdLib FM card"
> > -     select SND_OPL3_LIB
> > +     depends on SND_OPL3_LIB
>
> ... won't work.  CONFIG_SND_OPL3_LIB is not enabled by itself but only
> to be selected.

Right, I missed that in my review. Not sure if this was a mistake in
my original patch or if it started in a later version.

I think for the ISA drivers, I would still add 'depends on HAS_IOPORT'
to both CONFIG_SND_ISA and CONFIG_SND_OPL3_LIB if only to
make it easier to understand, even though CONFIG_ISA requires
HAS_IOPORT already, and CONFIG_SND_OPL3_LIB cannot be
selected by itself.

For the PCI drivers, I think we need to add the same dependency
on anything that either selects SND_OPL3_LIB or calls inb()/outb()
directly.

       Arnd