> This patch introduces the __per_cpu_data tag for data, and the
> per_cpu() & this_cpu() macros to go with it.
>
> This allows us to get rid of all those special case structures
> springing up all over the place for CPU-local data.
Seems like we could do slightly better to have these local areas mapped to
the same virtual address on each processor, which does away with the need
for an entire level of indirection.
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