Re: [RFC][PATCH 12/13] stop_machine: Remove lglock

[Peter Zijlstra]

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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