linux-kernel - Re: [RFC 03/32] ACPI: Kconfig: add HAS

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Message-ID: <f9f698b44173c6906e49e17aa33a98e12da7f60b.camel@linux.ibm.com>
Date:   Mon, 27 Dec 2021 18:02:01 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        linux-riscv@...ts.infradead.org, linux-csky@...r.kernel.org,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [RFC 03/32] ACPI: Kconfig: add HAS_IOPORT dependencies

On Mon, 2021-12-27 at 17:47 +0100, Rafael J. Wysocki wrote:
> On Mon, Dec 27, 2021 at 5:44 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. As ACPI always uses I/O port access
> 
> The ARM64 people may not agree with this.

Maybe my wording is bad. This is my rewording of what Arnd had in his
original mail: "The ACPI subsystem needs access to I/O ports, so that
also gets a dependency."(
https://lore.kernel.org/lkml/CAK8P3a0MNbx-iuzW_-=0ab6-TTZzwV-PT_6gAC1Gp5PgYyHcrA@mail.gmail.com/
).

> 
> > we depend on HAS_IOPORT unconditionally.
> > 
> > Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> > Signed-off-by: Arnd Bergmann <arnd@...nel.org>
> > Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> > ---
> >  drivers/acpi/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> > index cdbdf68bd98f..b57f15817ede 100644
> > --- a/drivers/acpi/Kconfig
> > +++ b/drivers/acpi/Kconfig
> > @@ -9,6 +9,7 @@ config ARCH_SUPPORTS_ACPI
> >  menuconfig ACPI
> >         bool "ACPI (Advanced Configuration and Power Interface) Support"
> >         depends on ARCH_SUPPORTS_ACPI
> > +       depends on HAS_IOPORT
> >         select PNP
> >         select NLS
> >         default y if X86
> > --
> > 2.32.0
> >