Thanks for your reply. I will communicate with member of dri-devel further. I tried to reproduce this issue on master branch and there was no link error: ... CC arch/x86/boot/compressed/efi.o AS arch/x86/boot/compressed/efi_mixed.o CC arch/x86/boot/compressed/misc.o GZIP arch/x86/boot/compressed/vmlinux.bin.gz MKPIGGY arch/x86/boot/compressed/piggy.S AS arch/x86/boot/compressed/piggy.o LD arch/x86/boot/compressed/vmlinux ZOFFSET arch/x86/boot/zoffset.h OBJCOPY arch/x86/boot/vmlinux.bin AS arch/x86/boot/header.o LD arch/x86/boot/setup.elf OBJCOPY arch/x86/boot/setup.bin BUILD arch/x86/boot/bzImage Kernel: arch/x86/boot/bzImage is ready (#1) $ cat .config | grep 'CONFIG_DRM_KMS\|CONFIG_FB\b\|FBDEV_EMUL' CONFIG_DRM_KMS_HELPER=y CONFIG_DRM_FBDEV_EMULATION=y CONFIG_FB=m $ In the attachments you can find two ".config". kernel_config_515y_failed is used on branch 5.15.y (tag 5.15.157) and kernel_config_master_succeed is what I used for master branch. Masahiro Yamada <masahiroy@xxxxxxxxxx> 于2024年5月7日周二 23:06写道： > > Fw: DRM list > > On Mon, May 6, 2024 at 2:53 PM Henry Wu <triangletrap12@xxxxxxxxx> wrote: > > > > Hi, all. > > > > I found a link error related to DRM and fbdev on branch linux-5.15.y > > (tag v5.15.157). It has same phenomenon with > > https://lore.kernel.org/all/202303150232.MBonYhiv-lkp@xxxxxxxxx/. > > > > I tried to investigate this issue and found that build will fail if > > CONFIG_FB=m and it will succeed if CONFIG_FB=y. > > > > [user@localhost linux]$ cat .config | grep > > 'CONFIG_DRM_KMS\|CONFIG_FB\b\|FBDEV_EMUL' > > CONFIG_DRM_KMS_HELPER=y > > CONFIG_DRM_FBDEV_EMULATION=y > > CONFIG_FB=m > > [user@localhost linux]$ > > > > I'm not familiar with kbuild. Can anyone troubleshoot it further? You > > can find .config from attachment. > > > I do not have time to take a look at every build error, > but somebody in the DRM list may help you. > > > > -- > Best Regards > Masahiro Yamada
