Re: [PATCH 2/3 RFC paul/rcu/srcu] srcu: only increase the upper bitfor srcu_read_lock()

[Peter Zijlstra]

On Wed, 2012-02-22 at 17:29 +0800, Lai Jiangshan wrote:
> +       ACCESS_ONCE(this_cpu_ptr(sp->per_cpu_ref)->c[idx]) += -1;

That just looks funny.. 
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