linux-kernel - Re: [PATCH] fbdev/sh7760fb: Depend on FB=y

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Date:   Mon, 25 Sep 2023 10:06:36 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-fbdev@...r.kernel.org, kernel test robot <lkp@...el.com>,
        arnd@...db.de, Linux-sh list <linux-sh@...r.kernel.org>,
        deller@....de, rdunlap@...radead.org, javierm@...hat.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        oe-kbuild-all@...ts.linux.dev, glaubitz@...sik.fu-berlin.de,
        sam@...nborg.org
Subject: Re: [PATCH] fbdev/sh7760fb: Depend on FB=y

Hi Geert

Am 25.09.23 um 09:33 schrieb Geert Uytterhoeven:
> Hi Thomas,
> 
> On Mon, Sep 18, 2023 at 11:45 AM Thomas Zimmermann <tzimmermann@...e.de> wrote:
>> Fix linker error if FB=m about missing fb_io_read and fb_io_write. The
>> linker's error message suggests that this config setting has already
>> been broken for other symbols.
>>
>>    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'
>>
>> Suggested-by: Randy Dunlap <rdunlap@...radead.org>
>> Reported-by: kernel test robot <lkp@...el.com>
>> Closes: https://lore.kernel.org/oe-kbuild-all/202309130632.LS04CPWu-lkp@intel.com/
>> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
> 
> Thanks for your patch!
> 
>> --- a/drivers/video/fbdev/Kconfig
>> +++ b/drivers/video/fbdev/Kconfig
>> @@ -1756,7 +1756,7 @@ 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_*().

I've meanwhile fixed the immediate issue. But I don't see anything that 
would prevent the option and driver from being a tristate.

Best regards
Thomas

> 
> Gr{oetje,eeting}s,
> 
>                          Geert
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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