Re: [PATCH] rcu: Is it safe to enter an RCU read-side criticalsection?

[Peter Zijlstra]

On Fri, Sep 06, 2013 at 10:52:38AM -0700, Paul E. McKenney wrote:
> How about if I made rcu_is_cpu_idle() be as follows?
> 
> int rcu_is_cpu_idle(void)
> {
> 	int ret;
> 
> 	ret = (atomic_read(&per_cpu(rcu_dynticks.dynticks,
> 				    raw_smp_processor_id())) & 0x1) == 0;
> 	return ret;
> }


No, please use __raw_get_cpu_var(), that generates far better code. Also
any such trickery needs a coherent comment.
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