Re: [PATCH 4/9] net: openvswitch: use this_cpu_ptr per-cpu helper

[Christoph Lameter]

On Thu, 1 Nov 2012, Shan Wei wrote:

> But for different field in same per-cpu variable, how to guarantee n_missed
> and n_hit are from same cpu?
> this_cpu_read(dp->stats_percpu->n_missed);
> [processor changed]
> this_cpu_read(dp->stats_percpu->n_hit);

What does current guarantee that? If it is guaranteed then you can use the
__this_cpu_xxx ops.

> In addition, following usage of per_cpu_ptr can be replaced by this_cpu_read.
>
> cpu=get_cpu()
> ....
> *per_cpu_ptr(p,cpu)
> ....
> ....
> put_cpu()

Right.

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