by the option.
- Make the option depend on EXPERT if it should be hidden from normal users.
- Make any new source files implementing the function dependent on the CONFIG
- option in the Makefile (e.g. ``obj-$(CONFIG_XYZZY_SYSCALL) += xyzzy.c``).
+ option in the Makefile (e.g. ``obj-$(CONFIG_XYZZY_SYSCALL) += xyzzy.o``).
- Double check that the kernel still builds with the new CONFIG option turned
off.