linux-kernel - Re: sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:undefined reference to `fb_io

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Date:   Mon, 25 Sep 2023 09:32:00 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     kernel test robot <lkp@...el.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Sam Ravnborg <sam@...nborg.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        linux-fbdev@...r.kernel.org,
        Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:undefined reference
 to `fb_io_read'

Hi Randy,

On Wed, Sep 13, 2023 at 7:13 AM Randy Dunlap <rdunlap@...radead.org> wrote:
> On 9/12/23 15:42, kernel test robot wrote:
> > FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   3669558bdf354cd352be955ef2764cde6a9bf5ec
> > commit: 5f86367006c6a0662faaf36f753f437afe42fb63 fbdev/sh7760fb: Use fbdev I/O helpers
> > date:   6 weeks ago
> > config: sh-randconfig-r012-20230913 (https://download.01.org/0day-ci/archive/20230913/202309130632.LS04CPWu-lkp@intel.com/config)
> > compiler: sh4-linux-gcc (GCC) 13.2.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230913/202309130632.LS04CPWu-lkp@intel.com/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@...el.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202309130632.LS04CPWu-lkp@intel.com/
> >
> > All errors (new ones prefixed by >>):
> >
> >    sh4-linux-ld: drivers/video/fbdev/sh7760fb.o: in function `sh7760fb_probe':
> >    sh7760fb.c:(.text+0x374): undefined reference to `framebuffer_alloc'
> >    sh4-linux-ld: sh7760fb.c:(.text+0x394): undefined reference to `fb_videomode_to_var'
> >    sh4-linux-ld: sh7760fb.c:(.text+0x39c): undefined reference to `fb_alloc_cmap'
> >    sh4-linux-ld: sh7760fb.c:(.text+0x3a4): undefined reference to `register_framebuffer'
> >    sh4-linux-ld: sh7760fb.c:(.text+0x3ac): undefined reference to `fb_dealloc_cmap'
> >    sh4-linux-ld: sh7760fb.c:(.text+0x434): undefined reference to `framebuffer_release'
> >    sh4-linux-ld: drivers/video/fbdev/sh7760fb.o: in function `sh7760fb_remove':
> >    sh7760fb.c:(.text+0x800): undefined reference to `unregister_framebuffer'
> >    sh4-linux-ld: sh7760fb.c:(.text+0x804): undefined reference to `fb_dealloc_cmap'
> >    sh4-linux-ld: sh7760fb.c:(.text+0x814): undefined reference to `framebuffer_release'
> >>> sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0xc): undefined reference to `fb_io_read'
> >>> sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x10): undefined reference to `fb_io_write'
> >    sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x2c): undefined reference to `cfb_fillrect'
> >    sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x30): undefined reference to `cfb_copyarea'
> >    sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x34): undefined reference to `cfb_imageblit'
>
> The problem is CONFIG_FB=m and CONFIG_FB_SH7760=y.
>
> This can be fixed by this simple change ... if it's correct.
>
> or this Kconfig entry can be made into a tristate, but that may not
> help with booting a system.

What kind of problem do you foresee? Users could still configure it builtin
when needed.

I see no reason to restrict this to builtin.
The driver already has all MODULE_*() boilerplate.

> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -1762,7 +1762,7 @@ config FB_COBALT
>
>  config FB_SH7760
>         bool "SH7760/SH7763/SH7720/SH7721 LCDC support"
> -       depends on FB && (CPU_SUBTYPE_SH7760 || CPU_SUBTYPE_SH7763 \
> +       depends on FB=y && (CPU_SUBTYPE_SH7760 || CPU_SUBTYPE_SH7763 \
>                 || CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721)
>         select FB_IOMEM_HELPERS
>         help

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