Re: [RFC][PATCH 0/5] preempt_count rework

[H. Peter Anvin]

On 08/14/2013 09:52 AM, Peter Zijlstra wrote:
> 
> Oh curses, this is because lea can't do segment offsets? So there's no
> sane way to get addresses of per-cpu variables.
> 
> Because ideally we'd have something like:
> 
>   lea %gs:__percpu_runqueues,%rax
> 
> So in this case it makes sense to also store the actual pointer; how
> unfortunate.
> 

Correct; the segment offset is not part of the effective address, even
in 64-bit mode.

	-hpa

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