Re: [PATCH v3 1/9] vgacon: rework Kconfig dependencies

Geert Uytterhoeven
2023-10-10T10:27:00Z

Hi Arnd,

On Mon, Oct 9, 2023 at 11:19 PM Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The list of dependencies here is phrased as an opt-out, but this is missing
> a lot of architectures that don't actually support VGA consoles, and some
> of the entries are stale:
>
> - powerpc used to support VGA consoles in the old arch/ppc codebase, but
> the merged arch/powerpc never did
>
> - arm lists footbridge, integrator and netwinder, but netwinder is actually
> part of footbridge, and integrator does not appear to have an actual
> VGA hardware, or list it in its ATAG or DT.
>
> - mips has a few platforms (malta, sibyte, and sni) that initialize
> screen_info, on everything else the console is selected but cannot
> actually work.
>
> - csky, hexgagon, loongarch, nios2, riscv and xtensa are not listed
> in the opt-out table and declare a screen_info to allow building
> vga_con, but this cannot work because the console is never selected.
>
> Replace this with an opt-in table that lists only the platforms that
> remain. This is effectively x86, plus a couple of historic workstation
> and server machines that reused parts of the x86 system architecture.
>
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> Reviewed-by: Khalid Aziz <khalid@gonehiking.org>
> Acked-by: Helge Deller <deller@gmx.de>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Thanks for your patch!

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>

A few suggestions for simplification below...

> --- a/drivers/video/console/Kconfig
> +++ b/drivers/video/console/Kconfig
> @@ -7,9 +7,9 @@ menu "Console display driver support"
>
> config VGA_CONSOLE
> bool "VGA text console" if EXPERT || !X86
> - depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC && !SUPERH && \
> - (!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
> - !ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !S390 && !UML
> + depends on ALPHA || IA64 || X86 || \
> + (ARM && ARCH_FOOTBRIDGE) || \

You can drop "ARM &&", as it is implied by ARCH_FOOTBRIDGE.

> + (MIPS && (MIPS_MALTA || SIBYTE_BCM112X || SIBYTE_SB1250 || SIBYTE_BCM1x80 || SNI_RM))

Likewise for "MIPS &&".

The 3 SIBYTE dependencies can be replaced by SIBYTE_SB1xxx_SOC.

> select APERTURE_HELPERS if (DRM || FB || VFIO_PCI_CORE)
> default y
> help

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