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SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
Jeremy Fitzhardinge wrote:
>
> Percpu on i386 hasn't been a point of discussion. It works fine, and
> has been working fine for a long time. The same mechanism would work
> fine on x86-64. Its only "issue" is that it doesn't support the broken
> gcc abi for stack-protector.
>
> The problem is all zero-based percpu on x86-64.
>

Well, x86-64 has *two* issues: limited range of offsets (regardless of
if we do RIP-relative or not), and the stack-protector ABI.

I'm still trying to reproduce Mike's setup, but I suspect it can be
switched to RIP-relative for the fixed-offset (static) stuff; for the
dynamic stuff it's all via pointers anyway so the offsets don't matter.

-hpa


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