Building with the attached random configuration file,
sound/built-in.o: In function `snd_jack_new':
/home/jim/linux/sound/core/jack.c:229: undefined reference to
`input_allocate_device'
/home/jim/linux/sound/core/jack.c:241: undefined reference to
`input_set_capability'
/home/jim/linux/sound/core/jack.c:261: undefined reference to
`input_free_device'
sound/built-in.o: In function `snd_jack_dev_disconnect':
/home/jim/linux/sound/core/jack.c:54: undefined reference to
`input_unregister_device'
/home/jim/linux/sound/core/jack.c:56: undefined reference to `input_free_device'
sound/built-in.o: In function `snd_jack_dev_register':
/home/jim/linux/sound/core/jack.c:106: undefined reference to
`input_set_capability'
/home/jim/linux/sound/core/jack.c:109: undefined reference to
`input_register_device'
sound/built-in.o: In function `input_report_key':
/home/jim/linux/include/linux/input.h:389: undefined reference to `input_event'
sound/built-in.o: In function `input_report_switch':
/home/jim/linux/include/linux/input.h:409: undefined reference to `input_event'
sound/built-in.o: In function `input_sync':
/home/jim/linux/include/linux/input.h:414: undefined reference to `input_event'
Makefile:939: recipe for target 'vmlinux' failed