linux-kernel - Re: build failure in linux-next: offb missing fb helpers

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Date:   Fri, 18 Nov 2022 22:20:30 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Michal Suchánek <msuchanek@...e.de>,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-fbdev@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: build failure in linux-next: offb missing fb helpers

Hi--

[adding Masahiro-san]


On 11/18/22 07:03, Michal Suchánek wrote:
> Hello,
> 
> I am seeing these errors:
> 
> [ 3825s]   AR      built-in.a
> [ 3827s]   AR      vmlinux.a
> [ 3835s]   LD      vmlinux.o
> [ 3835s]   OBJCOPY modules.builtin.modinfo
> [ 3835s]   GEN     modules.builtin
> [ 3835s]   GEN     .vmlinux.objs
> [ 3848s]   MODPOST Module.symvers
> [ 3848s]   CC      .vmlinux.export.o
> [ 3849s]   UPD     include/generated/utsversion.h
> [ 3849s]   CC      init/version-timestamp.o
> [ 3849s]   LD      .tmp_vmlinux.btf
> [ 3864s] ld: drivers/video/fbdev/offb.o:(.data.rel.ro+0x58): undefined
> reference to `cfb_fillrect'
> [ 3864s] ld: drivers/video/fbdev/offb.o:(.data.rel.ro+0x60): undefined
> reference to `cfb_copyarea'
> [ 3864s] ld: drivers/video/fbdev/offb.o:(.data.rel.ro+0x68): undefined
> reference to `cfb_imageblit'
> 
> cfb_fillrect is provided by drivers/video/fbdev/core/cfbfillrect.c
> 
> It is compiled when CONFIG_FB_CFB_FILLRECT
> drivers/video/fbdev/core/Makefile:obj-$(CONFIG_FB_CFB_FILLRECT)  += cfbfillrect.o
> 
> drivers/video/fbdev/Makefile:obj-$(CONFIG_FB_OF)               += offb.o
> is compiled when CONFIG_FB_OF
> 
> It selects CONFIG_FB_CFB_FILLRECT
> config FB_OF
>         bool "Open Firmware frame buffer device support"
>         depends on (FB = y) && PPC && (!PPC_PSERIES || PCI)
>         select APERTURE_HELPERS
>         select FB_CFB_FILLRECT
>         select FB_CFB_COPYAREA
>         select FB_CFB_IMAGEBLIT
>         select FB_MACMODES
> 
> The config has FB_OF built-in and FB_CFB_FILLRECT modular
> config/ppc64le/vanilla:CONFIG_FB_CFB_FILLRECT=m
> config/ppc64le/vanilla:CONFIG_FB_CFB_COPYAREA=m
> config/ppc64le/vanilla:CONFIG_FB_CFB_IMAGEBLIT=m
> config/ppc64le/vanilla:CONFIG_FB_OF=y
> 
> It only depends on FB which mut be built-in for FB_OF
> config FB_CFB_FILLRECT
>         tristate
>         depends on FB
> 
> Is select in kconfig broken?
> 
> Attachnig the config in question.

The symbol info from xconfig says:

Symbol: FB_CFB_FILLRECT [=m]
Type : tristate
Defined at drivers/video/fbdev/Kconfig:69
Depends on: HAS_IOMEM [=y] && FB [=y]
Selected by [m]:
[deleted]
- FB_OF [=y] && HAS_IOMEM [=y] && FB [=y]=y && PPC [=y] && (!PPC_PSERIES [=y] || PCI [=y]) && !DRM_OFDRM [=m]

I don't see why the 'select' from (bool) FB_OF would leave FB_CFB_FILLRECT (and the others)
as =m instead of =y.

Hopefully Masahiro can shed some light on this.

-- 
~Randy