linux-kernel - Re: [PATCH 6/6] nohz: Use IPI implicit full barrier against rq->nr

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Message-ID: <20140610154813.GE3213@twins.programming.kicks-ass.net>
Date:	Tue, 10 Jun 2014 17:48:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Kevin Hilman <khilman@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 6/6] nohz: Use IPI implicit full barrier against
 rq->nr_running r/w

On Tue, Jun 10, 2014 at 05:15:09PM +0200, Frederic Weisbecker wrote:
> +       /*
> +	* More than one running task need preemption.
> +	* nr_running update is assumed to be visible
> +	* after IPI is sent from wakers.
> +	*/

That looks like whitespace damage.

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