This was sorely misguided.
If you change the SMP configuration then *of course* the whole kernel would
need to be recompiled. The way Linux SMP is coded any file that refers to the
current process structure, for example, does need to be recompiled. No amount
of smart configuration would ever change that.
Smart configuration would benefit precisely the *other* kind of configuration
options. The ones that really ought only affect a single module or group of
files. Moving SMP from .config to the Makefile didn't accomplish anything
except make it easier to build broken kernels that are partially SMP and
partially not.
greg
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