Re: [PATCH v3 26/38] pnp: add HAS_IOPORT dependencies

From: Niklas Schnelle <schnelle@linux.ibm.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "Arnd Bergmann" <arnd@arndb.de>,
	"Jaroslav Kysela" <perex@perex.cz>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
	"Alan Stern" <stern@rowland.harvard.edu>,
	"Geert Uytterhoeven" <geert@linux-m68k.org>,
	"Paul Walmsley" <paul.walmsley@sifive.com>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-pci@vger.kernel.org, "Arnd Bergmann" <arnd@kernel.org>,
	linux-acpi@vger.kernel.org
Subject: Re: [PATCH v3 26/38] pnp: add HAS_IOPORT dependencies
Date: Thu, 23 Mar 2023 13:55:36 +0100	[thread overview]
Message-ID: <2bcabfceab658ae62bf854e5fdaf5bc916481359.camel@linux.ibm.com> (raw)
In-Reply-To: <CAJZ5v0gHFA_BgLuCx=Eb3J5D7f7j8kV3Pthqy3jAfpavY6UMuQ@mail.gmail.com>

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@kernel.org> wrote:
> > 
> > On Tue, Mar 14, 2023 at 1:13 PM Niklas Schnelle <schnelle@linux.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@kernel.org>
> > > Signed-off-by: Niklas Schnelle <schnelle@linux.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