Re: Real-Time Preemption and RCU

[Ingo Molnar]

* Esben Nielsen <simlo@xxxxxxxxxx> wrote:

> +static inline void rcu_read_lock(void)
> +{	
> +	preempt_disable(); 
> +	__get_cpu_var(rcu_data).active_readers++;
> +	preempt_enable();
> +}

this is buggy. Nothing guarantees that we'll do the rcu_read_unlock() on
the same CPU, and hence ->active_readers can get out of sync.

	Ingo
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