I've been running 2.4.0 for a few weeks.  I recently pulled down 2.4.2, compiled it, and installed it.  Things are working fine.  However, I was playing around with a kernel module.  After I compile the source with gcc, and try to load it up with insmod, I get the following error:

kernel-module version mismatch
        test.o was compiled for kernel version 2.4.0-0.26
        while this kernel is version 2.4.2.

        Any ideas on why I'm compiling for kernel version 2.4.0 when I'm running kernel 2.4.2?

Thanks,
Cory