linux-kernel - Re: [RFC 05/32] char: impi, tpm: depend on HAS

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Date:   Tue, 28 Dec 2021 13:13:03 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.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>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Corey Minyard <minyard@....org>,
        Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        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 <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        openipmi-developer@...ts.sourceforge.net,
        linux-integrity <linux-integrity@...r.kernel.org>
Subject: Re: [RFC 05/32] char: impi, tpm: depend on HAS_IOPORT

On Tue, 2021-12-28 at 11:17 +0100, Geert Uytterhoeven wrote:
> Hi Niklas,
> 
> Thanks for your patch!
> 
> On Mon, Dec 27, 2021 at 5:51 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 add this dependency and ifdef
> > sections of code using inb()/outb() as alternative access methods.
> > 
> > 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/char/Kconfig             |  3 ++-
> 
> Your oneline-summary doesn't cover this file.

Thanks, I guess then I should go with "char: depend on HAS_IOPORT"

> 
> >  drivers/char/ipmi/Makefile       | 11 ++++-------
> >  drivers/char/ipmi/ipmi_si_intf.c |  3 ++-
> >  drivers/char/ipmi/ipmi_si_pci.c  |  3 +++
> >  drivers/char/tpm/Kconfig         |  1 +
> >  drivers/char/tpm/tpm_infineon.c  | 14 ++++++++++----
> >  drivers/char/tpm/tpm_tis_core.c  | 19 ++++++++-----------
> >  7 files changed, 30 insertions(+), 24 deletions(-)
> > 
> > diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> > index 740811893c57..3d046e364e53 100644
> > --- a/drivers/char/Kconfig
> > +++ b/drivers/char/Kconfig
> > @@ -33,6 +33,7 @@ config TTY_PRINTK_LEVEL
> >  config PRINTER
> >         tristate "Parallel printer support"
> >         depends on PARPORT
> > +       depends on HAS_IOPORT
> 
> Why? drivers/char/lp.c doesn't use I/O accessors, and should work with
> all parport drivers.

You're right that should work.

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds