No, no, no. It's all the uncommented code which brings in the dollars.
> c = smp_get_cpuid(); // disables preemption
>
> ...
> f(); // oops, me forgotee, this function also references cpuid
> ..
> x = ++local_cache[c]; // live dangerously
> smp_put_cpuid(); // G_d knows what that does now.
>
preempt_disable() nests. It's not a problem.
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