Linux kernels aren't "locked." If you want to make changes to it, you just have to recompile it from source. It has a fairly easy to use configuration program to aid you.
The kernel is the core of the operating system.It is loaded into memory when the system is booted and communicates directly with the hardware.Users programs that need to access the hardware,use the...
You can have as many compiled kernels in your Linux installation as you want (disk space is your limit). However, you can only boot one kernel at a time.