[media] Add and use IS_REACHABLE macro

In the media drivers, the v4l2 core knows about all submodules
and calls into them from a common function. However this cannot
work if the modules that get called are loadable and the
core is built-in. In that case we get

drivers/built-in.o: In function `set_type':
drivers/media/v4l2-core/tuner-core.c:301: undefined reference to `tea5767_attach'
drivers/media/v4l2-core/tuner-core.c:307: undefined reference to `tea5761_attach'
drivers/media/v4l2-core/tuner-core.c:349: undefined reference to `tda9887_attach'
drivers/media/v4l2-core/tuner-core.c:405: undefined reference to `xc4000_attach'

This was working previously, until the IS_ENABLED() macro was used
to replace the construct like

 #if defined(CONFIG_DVB_CX24110) || (defined(CONFIG_DVB_CX24110_MODULE) && defined(MODULE))

with the difference that the new code no longer checks whether it is being
built as a loadable module itself.

To fix this, this new patch adds an 'IS_REACHABLE' macro, which evaluates
true in exactly the condition that was used previously. The downside
of this is that this trades an obvious link error for a more subtle
runtime failure, but it is clear that the change that introduced the
link error was unintentional and it seems better to revert it for
now. Also, a similar change was originally created by Trent Piepho
and then reverted by teh change to the IS_ENABLED macro.

Ideally Kconfig would be used to avoid the case of a broken dependency,
or the code restructured in a way to turn around the dependency, but either
way would require much larger changes here.

Fixes: 7b34be71db53 ("[media] use IS_ENABLED() macro")
See-also: c5dec9fb248e ("V4L/DVB (4751): Fix DBV_FE_CUSTOMISE for card drivers compiled into kernel")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/media/dvb-frontends/tda1002x.h b/drivers/media/dvb-frontends/tda1002x.h
index e404b6e44802..0d334613de1b 100644
--- a/drivers/media/dvb-frontends/tda1002x.h
+++ b/drivers/media/dvb-frontends/tda1002x.h
@@ -57,7 +57,7 @@ struct tda10023_config {
 	u16 deltaf;
 };
 
-#if IS_ENABLED(CONFIG_DVB_TDA10021)
+#if IS_REACHABLE(CONFIG_DVB_TDA10021)
 extern struct dvb_frontend* tda10021_attach(const struct tda1002x_config* config,
 					    struct i2c_adapter* i2c, u8 pwm);
 #else
@@ -69,7 +69,7 @@ static inline struct dvb_frontend* tda10021_attach(const struct tda1002x_config*
 }
 #endif // CONFIG_DVB_TDA10021
 
-#if IS_ENABLED(CONFIG_DVB_TDA10023)
+#if IS_REACHABLE(CONFIG_DVB_TDA10023)
 extern struct dvb_frontend *tda10023_attach(
 	const struct tda10023_config *config,
 	struct i2c_adapter *i2c, u8 pwm);