Use "select"s to ensure that the required kconfig symbols are set as expected. This fixes build errors when CONFIG_SOUND is not set. ld: arch/um/drivers/hostaudio_kern.o: in function `hostaudio_cleanup_module': hostaudio_kern.c:(.exit.text+0xa): undefined reference to `unregister_sound_mixer' ld: hostaudio_kern.c:(.exit.text+0x15): undefined reference to `unregister_sound_dsp' ld: arch/um/drivers/hostaudio_kern.o: in function `hostaudio_init_module': hostaudio_kern.c:(.init.text+0x19): undefined reference to `register_sound_dsp' ld: hostaudio_kern.c:(.init.text+0x31): undefined reference to `register_sound_mixer' ld: hostaudio_kern.c:(.init.text+0x49): undefined reference to `unregister_sound_dsp' Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Fixes: d886e87cb82b ("sound: make OSS sound core optional") Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Link: lore.kernel.org/r/202307141416.vxuRVpFv-lkp@xxxxxxxxx Cc: Richard Weinberger <richard@xxxxxx> Cc: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx> Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx> Cc: linux-um@xxxxxxxxxxxxxxxxxxx Cc: Tejun Heo <tj@xxxxxxxxxx> Cc: Takashi Iwai <tiwai@xxxxxxx> Cc: Jaroslav Kysela <perex@xxxxxxxx> Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx> Cc: Nathan Chancellor <nathan@xxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Nicolas Schier <nicolas@xxxxxxxxx> Cc: linux-kbuild@xxxxxxxxxxxxxxx --- v2: don't delete the HOSTAUDIO Kconfig entry (Masahiro) arch/um/drivers/Kconfig | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff -- a/arch/um/drivers/Kconfig b/arch/um/drivers/Kconfig --- a/arch/um/drivers/Kconfig +++ b/arch/um/drivers/Kconfig @@ -111,20 +111,14 @@ config SSL_CHAN config UML_SOUND tristate "Sound support" + select SOUND + select SOUND_OSS_CORE help This option enables UML sound support. If enabled, it will pull in soundcore and the UML hostaudio relay, which acts as a intermediary between the host's dsp and mixer devices and the UML sound system. It is safe to say 'Y' here. -config SOUND - tristate - default UML_SOUND - -config SOUND_OSS_CORE - bool - default UML_SOUND - config HOSTAUDIO tristate default UML_SOUND