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

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Date:   Tue, 12 Sep 2023 22:13:34 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     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
Subject: Re: sh4-linux-ld: drivers/video/fbdev/sh7760fb.o:undefined reference
 to `fb_io_read'



On 9/12/23 15:42, kernel test robot wrote:
> Hi Thomas,
> 
> 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.

~~~
diff -- a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
--- 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


-- 
~Randy