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SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
Jeremy Fitzhardinge wrote:
>
>> Its best to consistently access
>> per cpu variables using the segment registers.
>
> It is, but initially the segment base is 0, so just using a percpu
> variable does something sensible from the start with no special setup.
>

That's easy enough to fix -- synthesizing a GDT entry is trivial enough
-- but since it currently works, and since the offsets on 32 bits can
reach the full address space anyway, there is no reason to change.

-hpa


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