When # CONFIG_EFI is not set, there are 2 definitions of sysfb_apply_efi_quirks(). The stub from sysfb.h should be used and the __init function from sysfb_efi.c should not be used. ../drivers/firmware/efi/sysfb_efi.c:337:13: error: redefinition of ‘sysfb_apply_efi_quirks’ __init void sysfb_apply_efi_quirks(struct platform_device *pd) ^~~~~~~~~~~~~~~~~~~~~~ In file included from ../drivers/firmware/efi/sysfb_efi.c:26:0: ../include/linux/sysfb.h:65:20: note: previous definition of ‘sysfb_apply_efi_quirks’ was here static inline void sysfb_apply_efi_quirks(struct platform_device *pd) ^~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx> Cc: linux-efi@xxxxxxxxxxxxxxx Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx Cc: Javier Martinez Canillas <javierm@xxxxxxxxxx> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx> Cc: Mark Brown <broonie@xxxxxxxxxx> Cc: linux-next@xxxxxxxxxxxxxxx --- drivers/firmware/efi/sysfb_efi.c | 2 ++ 1 file changed, 2 insertions(+) --- linext-20210726.orig/drivers/firmware/efi/sysfb_efi.c +++ linext-20210726/drivers/firmware/efi/sysfb_efi.c @@ -332,6 +332,7 @@ static const struct fwnode_operations ef .add_links = efifb_add_links, }; +#ifdef CONFIG_EFI static struct fwnode_handle efifb_fwnode; __init void sysfb_apply_efi_quirks(struct platform_device *pd) @@ -354,3 +355,4 @@ __init void sysfb_apply_efi_quirks(struc pd->dev.fwnode = &efifb_fwnode; } } +#endif