Nonononono, this is not really how a kernel works.
Granted, the ./usr/src should hold the source code of the current kernel. Your distro should have that in the repo. You could download that.
But, if you want to compile a kernel, there needs to be a
good reason for it. Kernels are fairly well fine-tuned to most needs, so a recompile needs to be founded in some extra need.
Is there a reason to recompile, then go tahe these steps (roughly)
Find out what kernel you use now:
...will return the version number. Go to the site and download that package. Put it in
your folder after unpacking.
Enter
to do the tweaks, then
to compile and finally
Tweak the GRUB as required.
If you'd use a newer version, be aware that the ODD numbers are experimental, the EVEN numbers are stable. The choice (of course)
is yours...
At any rate, whatever is installed on the system will/should run.
See a kernel as an engine in a Lambo. By recompiling it, you basically get to choose the engine before you drive out of the garage.
In the GRUB menu, you get to choose the kernel, the old (and fully working one) stays around, if all goes bad, restart the system, and choose the previous kernel and you're off...
Thor
