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Subject: Re: [PATCH V2 1/4] vgaarb: Add support for setting the default video device
From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Matthew Garrett <mjg@redhat.com>
Cc: linux-kernel@vger.kernel.org, benh@kernel.crashing.org, airlied@redhat.com
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On Mon, Apr 16, 2012 at 22:26, Matthew Garrett <mjg@redhat.com> wrote:
> --- a/include/linux/vgaarb.h
> +++ b/include/linux/vgaarb.h
> @@ -31,6 +31,7 @@
>  #ifndef LINUX_VGA_H
>  #define LINUX_VGA_H
>
> +#include <video/vga.h>

Is this include really needed? x86_64/allmodconfig builds fine without it.

It causes m68k/allmodconfig to fail with:

In file included from include/linux/vgaarb.h:35,
                 from drivers/gpu/drm/drm_irq.c:43:
include/video/vga.h: In function ‘vga_mm_r’:
include/video/vga.h:242: error: implicit declaration of function ‘z_readb’
include/video/vga.h: In function ‘vga_mm_w’:
include/video/vga.h:247: error: implicit declaration of function ‘z_writeb’
include/video/vga.h: In function ‘vga_mm_w_fast’:
include/video/vga.h:253: error: implicit declaration of function ‘z_writew’
make[1]: *** [drivers/gpu/drm/drm_irq.o] Error 1

http://kisskb.ellerman.id.au/kisskb/buildresult/6127136/

Currently <video/vga.h> has a crude hack to make cirrusfb work on Amiga,
but that's the only VGA support m68k has.
There's also no <asm/vga.h>, so m68k/allmodconfig with CONFIG_AMIGA
disabled now fails with:

In file included from include/linux/vgaarb.h:34,
                 from drivers/gpu/drm/drm_irq.c:42:
include/video/vga.h:23:21: error: asm/vga.h: No such file or directory
make[1]: *** [drivers/gpu/drm/drm_irq.o] Error 1

Removing the #include <video/vga.h> fixes both cases.

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