linux-kernel - Re: [PATCH v3 26/38] pnp: add HAS

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Date:   Thu, 23 Mar 2023 13:55:36 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Jaroslav Kysela <perex@...ex.cz>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v3 26/38] pnp: add HAS_IOPORT dependencies

On Tue, 2023-03-21 at 14:56 +0100, Rafael J. Wysocki wrote:
> On Mon, Mar 20, 2023 at 6:37 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> > 
> > On Tue, Mar 14, 2023 at 1:13 PM Niklas Schnelle <schnelle@...ux.ibm.com> wrote:
> > > 
> > > In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> > > not being declared. We thus need to depend on HAS_IOPORT even when
> > > compile testing only.
> > > 
> > > Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> > > Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> > > ---
> > >  drivers/pnp/isapnp/Kconfig | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/pnp/isapnp/Kconfig b/drivers/pnp/isapnp/Kconfig
> > > index d0479a563123..79bd48f1dd94 100644
> > > --- a/drivers/pnp/isapnp/Kconfig
> > > +++ b/drivers/pnp/isapnp/Kconfig
> > > @@ -4,7 +4,7 @@
> > >  #
> > >  config ISAPNP
> > >         bool "ISA Plug and Play support"
> > > -       depends on ISA || COMPILE_TEST
> > > +       depends on ISA || (HAS_IOPORT && COMPILE_TEST)
> 
> This breaks code selecting ISAPNP and not depending on it.  See
> https://lore.kernel.org/linux-acpi/202303211932.5gtCVHCz-lkp@intel.com/T/#u
> for example.
> 
> I'm dropping the patch now, please fix and resend.
> 
> > 

Sorry if this wasn't super clear but all patches in this series depend
on patch 1 which introduces the HAS_IOPORT Kconfig option. There's
really two options, either the whole series goes via e.g. Arnd's tree
at once or we first only merge patch 1 and then add the rest per
subsystem until finally the last patch can remove inb()/outb() when
HAS_IOPORT is unset.

That said I'm a little unsure about the linked error if that is just
due to missing HAS_IOPORT or something else. I'll still have to try
with the instructions in that mail and will report back if it is
something else.

Thanks,
Niklas