[v4] um/drivers: fix hostaudio build errors

Use "select"s to ensure that the required kconfig symbols are set
as expected.
Drop HOSTAUDIO since it is now equivalent to UML_SOUND.

Allow SOUND with UML regardless of HAS_IOMEM. Otherwise there is a
kconfig warning for unmet dependencies. (This was not an issue when
SOUND was defined in arch/um/drivers/Kconfig. I have done 50 randconfig
builds and didn't find any issues.)

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'

and this kconfig warning:
WARNING: unmet direct dependencies detected for SOUND

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Fixes: d886e87cb82b ("sound: make OSS sound core optional")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Closes: lore.kernel.org/r/202307141416.vxuRVpFv-lkp@intel.com
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: linux-um@lists.infradead.org
Cc: Tejun Heo <tj@kernel.org>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: linux-kbuild@vger.kernel.org
Cc: alsa-devel@alsa-project.org
---
v2: don't delete the HOSTAUDIO Kconfig entry (Masahiro)
v3: drop HOSTAUDIO and use CONFIG_UML_SOUND for it in Makefile (Takashi);
    add SOUND depends on "|| UML" to HAS_IOMEM
v4: use depends on instead of select for SOUND (Masahiro);
    use Closes: instead of Link:

 arch/um/drivers/Kconfig  |   16 +++-------------
 arch/um/drivers/Makefile |    2 +-
 sound/Kconfig            |    2 +-
 3 files changed, 5 insertions(+), 15 deletions(-)

On Tue, Aug 1, 2023 at 11:05 AM Randy Dunlap <rdunlap@infradead.org> wrote:
>
> Use "select"s to ensure that the required kconfig symbols are set
> as expected.

Using plural, "select"s, sounds odd now.

Use "select" and "depends on" to ensure ...  ?




As I said in the previous email,
you need to add CONFIG_SOUND=y
to arch/um/configs/{i386,x86_64}_defconfig,
otherwise CONFIG_UML_SOUND is hidden.





> Drop HOSTAUDIO since it is now equivalent to UML_SOUND.
>
> Allow SOUND with UML regardless of HAS_IOMEM. Otherwise there is a
> kconfig warning for unmet dependencies. (This was not an issue when
> SOUND was defined in arch/um/drivers/Kconfig. I have done 50 randconfig
> builds and didn't find any issues.)
>
> 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'
>
> and this kconfig warning:
> WARNING: unmet direct dependencies detected for SOUND
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Fixes: d886e87cb82b ("sound: make OSS sound core optional")
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: lore.kernel.org/r/202307141416.vxuRVpFv-lkp@intel.com
> Cc: Richard Weinberger <richard@nod.at>
> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
> Cc: Johannes Berg <johannes@sipsolutions.net>
> Cc: linux-um@lists.infradead.org
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Takashi Iwai <tiwai@suse.de>
> Cc: Jaroslav Kysela <perex@perex.cz>
> Cc: Masahiro Yamada <masahiroy@kernel.org>
> Cc: Nathan Chancellor <nathan@kernel.org>
> Cc: Nick Desaulniers <ndesaulniers@google.com>
> Cc: Nicolas Schier <nicolas@fjasle.eu>
> Cc: linux-kbuild@vger.kernel.org
> Cc: alsa-devel@alsa-project.org
> ---
> v2: don't delete the HOSTAUDIO Kconfig entry (Masahiro)
> v3: drop HOSTAUDIO and use CONFIG_UML_SOUND for it in Makefile (Takashi);
>     add SOUND depends on "|| UML" to HAS_IOMEM
> v4: use depends on instead of select for SOUND (Masahiro);
>     use Closes: instead of Link:
>
>  arch/um/drivers/Kconfig  |   16 +++-------------
>  arch/um/drivers/Makefile |    2 +-
>  sound/Kconfig            |    2 +-
>  3 files changed, 5 insertions(+), 15 deletions(-)
>
> diff -- a/arch/um/drivers/Kconfig b/arch/um/drivers/Kconfig
> --- a/arch/um/drivers/Kconfig
> +++ b/arch/um/drivers/Kconfig
> @@ -111,24 +111,14 @@ config SSL_CHAN
>
>  config UML_SOUND
>         tristate "Sound support"
> +       depends on 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
> +         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
> -
>  endmenu
>
>  menu "UML Network Devices"
> diff -- a/sound/Kconfig b/sound/Kconfig
> --- a/sound/Kconfig
> +++ b/sound/Kconfig
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  menuconfig SOUND
>         tristate "Sound card support"
> -       depends on HAS_IOMEM
> +       depends on HAS_IOMEM || UML
>         help
>           If you have a sound card in your computer, i.e. if it can say more
>           than an occasional beep, say Y.
> diff -- a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
> --- a/arch/um/drivers/Makefile
> +++ b/arch/um/drivers/Makefile
> @@ -54,7 +54,7 @@ obj-$(CONFIG_UML_NET) += net.o
>  obj-$(CONFIG_MCONSOLE) += mconsole.o
>  obj-$(CONFIG_MMAPPER) += mmapper_kern.o
>  obj-$(CONFIG_BLK_DEV_UBD) += ubd.o
> -obj-$(CONFIG_HOSTAUDIO) += hostaudio.o
> +obj-$(CONFIG_UML_SOUND) += hostaudio.o
>  obj-$(CONFIG_NULL_CHAN) += null.o
>  obj-$(CONFIG_PORT_CHAN) += port.o
>  obj-$(CONFIG_PTY_CHAN) += pty.o