What it does is (a) always start with a valid config, and (b) not permit
any change that would make it invalid.
So, you froze X86 at startup. SMP gets asked early. If you specify
SMP=y, and then later try to set RTC=n, the configurator will not let
you do it and will explain why. At that point if you want you can go
back and change SMP.
> Perhaps I have missed something, but I really prefer the old oldconfig
> over the new oldconfig.
What's to prefer? You get essentially the same behavior unless you start
with a broken config.
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