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authorArnd Bergmann <arnd@arndb.de>2015-02-18 18:12:42 +0100
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-04-08 20:02:07 +0200
commit9b174527e7b756cda9f5d9e541f87b7fec9cfdf0 (patch)
tree832548b73f17871eff00880b7acef080991aa30a /drivers/media/dvb-frontends/dib8000.h
parent[media] si2168: tda10071: m88ds3103: Fix trivial typos (diff)
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[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>
Diffstat (limited to 'drivers/media/dvb-frontends/dib8000.h')
-rw-r--r--drivers/media/dvb-frontends/dib8000.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/dib8000.h b/drivers/media/dvb-frontends/dib8000.h
index 84cc10383dcd..780c37bdcb72 100644
--- a/drivers/media/dvb-frontends/dib8000.h
+++ b/drivers/media/dvb-frontends/dib8000.h
@@ -63,7 +63,7 @@ struct dib8000_ops {
struct dvb_frontend *(*init)(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib8000_config *cfg);
};
-#if IS_ENABLED(CONFIG_DVB_DIB8000)
+#if IS_REACHABLE(CONFIG_DVB_DIB8000)
void *dib8000_attach(struct dib8000_ops *ops);
#else
static inline int dib8000_attach(struct dib8000_ops *ops)