linux-kernel - Re: [PATCH tip/core/rcu 18/18] rcu: Better hotplug handling for synchronize_sched

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Date:	Thu, 8 Oct 2015 11:01:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 18/18] rcu: Better hotplug handling for
 synchronize_sched_expedited()

On Wed, Oct 07, 2015 at 09:26:53AM -0700, Paul E. McKenney wrote:
> On Wed, Oct 07, 2015 at 04:26:27PM +0200, Peter Zijlstra wrote:

> Indeed, that approach looks better than moving rcu_note_context_switch(),
> which probably results in deadlocks.  I will update my patch accordingly.

Yeah, calling rcu_note_context_switch() under the rq->lock is asking for
trouble we don't need.

Thanks!
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