linux-kernel - Re: [PATCH v3 35/38] video: handle HAS

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Date:   Wed, 15 Mar 2023 09:16:50 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helge Deller <deller@....de>,
        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>,
        "Rafael J. Wysocki" <rafael@...nel.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-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3 35/38] video: handle HAS_IOPORT dependencies

Hi Niklas,

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