[nzlug] Kernels (again) and patching

[Daniel Lawson]

> Sorry - my briefness surprises even me. It's a Linux kernel, compiled
> and configured by someone else. I'm trying to find out if he's
> compiled any functionality into the kernel which isn't part of the
> standard kernel. From what I can tell so far, it's probably a vanilla
> kernel based upon the configuration file - it's got a lot less options
> in there than the stock standard Debian kernel from around the same
> sort of time.

I believe that if you complete a kernel configuration, any .config
options that don't correspond to the current tree are removed.
So, if you run 'make oldconfig', then compare the current .config with
your original config file, it should show the differences.
I haven't tested this though, but you can test it pretty easily by
adding a bogus option just in case.