linux-kernel - Re: [PATCH] fbdev: sh7760fb: require FB=y to build cleanly

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Date:   Fri, 22 Sep 2023 09:23:20 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        Helge Deller <deller@....de>, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        linux-sh@...r.kernel.org
Subject: Re: [PATCH] fbdev: sh7760fb: require FB=y to build cleanly

Hi Randy,

On Thu, Sep 21, 2023 at 10:43 PM Randy Dunlap <rdunlap@...radead.org> wrote:
> Fix build errors when CONFIG_FB=m and CONFIG_FB_SH7760=y:
>
> sh2-linux-ld: drivers/video/fbdev/sh7760fb.o: in function `sh7760fb_probe':
> sh7760fb.c:(.text+0x374): undefined reference to `framebuffer_alloc'
> sh2-linux-ld: sh7760fb.c:(.text+0x394): undefined reference to `fb_videomode_to_var'
> sh2-linux-ld: sh7760fb.c:(.text+0x3a0): undefined reference to `fb_alloc_cmap'
> sh2-linux-ld: sh7760fb.c:(.text+0x3a4): undefined reference to `register_framebuffer'
> sh2-linux-ld: sh7760fb.c:(.text+0x3ac): undefined reference to `fb_dealloc_cmap'
> sh2-linux-ld: sh7760fb.c:(.text+0x434): undefined reference to `framebuffer_release'
> sh2-linux-ld: drivers/video/fbdev/sh7760fb.o: in function `sh7760fb_remove':
> sh7760fb.c:(.text+0x800): undefined reference to `unregister_framebuffer'
> sh2-linux-ld: sh7760fb.c:(.text+0x804): undefined reference to `fb_dealloc_cmap'
> sh2-linux-ld: sh7760fb.c:(.text+0x814): undefined reference to `framebuffer_release'
> sh2-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0xc): undefined reference to `fb_io_read'
> sh2-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x10): undefined reference to `fb_io_write'
> sh2-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x2c): undefined reference to `cfb_fillrect'
> sh2-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x30): undefined reference to `cfb_copyarea'
> sh2-linux-ld: drivers/video/fbdev/sh7760fb.o:(.rodata+0x34): undefined reference to `cfb_imageblit'
>
> Fixes: 4a25e41831ee ("video: sh7760fb: SH7760/SH7763 LCDC framebuffer driver")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>

Thanks for your patch!

> --- 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

Any reason this can't become tristate instead?
drivers/video/fbdev/sh7760fb.c uses module_platform_driver(), and
already has all needed MODULE_*().

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