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9b174527e7
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: |
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| .. | ||
| b2c2 | ||
| bt8xx | ||
| cx18 | ||
| cx88 | ||
| cx23885 | ||
| cx25821 | ||
| ddbridge | ||
| dm1105 | ||
| ivtv | ||
| mantis | ||
| meye | ||
| ngene | ||
| pluto2 | ||
| pt1 | ||
| pt3 | ||
| saa7134 | ||
| saa7146 | ||
| saa7164 | ||
| smipcie | ||
| solo6x10 | ||
| sta2x11 | ||
| ttpci | ||
| tw68 | ||
| zoran | ||
| Kconfig | ||
| Makefile | ||