Re: [PATCH 7/9] rcu: use this_cpu_ptr per-cpu helper instead ofper_cpu_ptr(p, raw_smp_processor_id())

[Christoph Lameter]

On Thu, 1 Nov 2012, Shan Wei wrote:

> Paul E. McKenney said, at 2012/11/1 4:08:
> >
> > One thing to keep in mind -- the only purpose of this is to diffuse
> > memory contention.  So there is no need to disable preemption.
>
> same question to me.
> Christoph, maybe __this_cpu_read is a better choice which don't disable preemption.

Correct. Use __this_cpu_read to reduce overhead on processor that require
emulation.

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