> The basic point is that if you do both SMP and UP have two choices:
>
> - #ifdef SMP the kernel and essentially run one kernel on UP
> and a different kernel on SMP
>
> - No ifdefs, run the SMP kernel on the UP's
- Self-modifying kernel
> The first choice is the route taken by SGI,
> the second is the route taken by Sun.
The third is the route taken by Digital (Compaq).
The kernel can modify itself to adjust for 5 different environments:
plain, SMP, real-time, real-time SMP, and debug checks.
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