Re: [PATCH v9 06/13] task_isolation: add debug boot flag

From: Steven Rostedt
Date: Mon Jan 04 2016 - 17:52:30 EST


On Mon, 4 Jan 2016 14:34:44 -0500
Chris Metcalf <cmetcalf@xxxxxxxxxx> wrote:


> +#ifdef CONFIG_TASK_ISOLATION
> +void task_isolation_debug(int cpu)
> +{
> + struct task_struct *p;
> +
> + if (!task_isolation_possible(cpu))
> + return;
> +
> + rcu_read_lock();

What's the rcu_read_lock() for? I don't see what is being protected by
rcu here?

-- Steve

> + p = cpu_curr(cpu);
> + get_task_struct(p);
> + rcu_read_unlock();
> + task_isolation_debug_task(cpu, p);
> + put_task_struct(p);
> +}
> +#endif
> +
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