Re: [PATCH RFC tip/core/rcu 1/9] rcu: Add call_rcu_tasks()

[Peter Zijlstra]

On Mon, Jul 28, 2014 at 03:56:12PM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
> 
> This commit adds a new RCU-tasks flavor of RCU, which provides
> call_rcu_tasks().  This RCU flavor's quiescent states are voluntary
> context switch (not preemption!), userspace execution, and the idle loop.
> Note that unlike other RCU flavors, these quiescent states occur in tasks,
> not necessarily CPUs.  Includes fixes from Steven Rostedt.

I've not found the userspace transition part, where that at?
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