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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Wed, 15 Mar 2023 09:16:50 +0100
Message-ID: <CAMuHMdW4f8GJ-kFDPg6Ao=g3ZAXq79u9nUZ_dW1LonHu+vxk8Q@mail.gmail.com>
Subject: Re: [PATCH v3 35/38] video: handle HAS_IOPORT dependencies
To:     Niklas Schnelle <schnelle@linux.ibm.com>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Helge Deller <deller@gmx.de>,
        Bjorn Helgaas <bhelgaas@google.com>,
        =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Alan Stern <stern@rowland.harvard.edu>,
        "Rafael J. Wysocki" <rafael@kernel.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-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org
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Hi Niklas,

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 add HAS_IOPORT as dependency for
> those drivers using them and guard inline code in headers.
>
> Co-developed-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>

Thanks for your patch!

> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig

> @@ -1284,7 +1285,7 @@ config FB_ATY128_BACKLIGHT
>
>  config FB_ATY
>         tristate "ATI Mach64 display support" if PCI || ATARI
> -       depends on FB && !SPARC32
> +       depends on FB && HAS_IOPORT && !SPARC32

On Atari, this works without ATARI_ROM_ISA, hence it must not depend
on HAS_IOPORT.
The only call to inb() is inside a section protected by #ifdef
CONFIG_PCI. So:

    depends on FB && !SPARC32
    depends on ATARI || HAS_IOPORT

>         select FB_CFB_FILLRECT
>         select FB_CFB_COPYAREA
>         select FB_CFB_IMAGEBLIT

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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