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Date:	Fri, 8 Aug 2014 12:49:31 -0400
From:	Steven Rostedt <>
To:	"Paul E. McKenney" <>
Cc:	Peter Zijlstra <>,
	Oleg Nesterov <>,,,,,,,,,,,,,,
Subject: Re: [PATCH v3 tip/core/rcu 3/9] rcu: Add synchronous grace-period
 waiting for RCU-tasks

On Fri, 8 Aug 2014 09:39:05 -0700
"Paul E. McKenney" <> wrote:

> Unless this is done in idle, at which point RCU-sched is studiously
> ignoring any preempt_disable() sections.

ftrace doesn't use synchronize_sched() today because of this. It
instead just does a "schedule_on_each_cpu()" and waits for that to
return before going further.

-- Steve
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