linux-kernel - Re: [RFC][PATCH 12/13] stop

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Message-ID: <20150624093102.GI18673@twins.programming.kicks-ass.net>
Date:	Wed, 24 Jun 2015 11:31:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, tj@...nel.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, der.herr@...r.at, dave@...olabs.net,
	riel@...hat.com, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 12/13] stop_machine: Remove lglock

On Wed, Jun 24, 2015 at 10:32:57AM +0200, Peter Zijlstra wrote:
> +	s = atomic_long_read(&rsp->expedited_done);
> +	if (ULONG_CMP_GE((ulong)s, (ulong)snap)) {
> +		/* ensure test happens before caller kfree */
> +		smp_mb__before_atomic(); /* ^^^ */

FWIW isn't that guaranteed by the control dep?

> +		atomic_long_inc(&rsp->expedited_workdone1);
> +		goto unlock;
> +	}
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