If you installed the kernel via rpm, just do
rpm -ev --test yourkernel
then, if no error message appears, repeat the command without the --test option. If you installed vanilla kernels from source, remove their source trees and delete the kernels with initrd and map files in the /boot directory, and their modules directory in /lib/modules/kernelversion; also update the grub menu removing the old entries.
- Yes, Spock?
- I can't believe my ears...