linux-kernel - Re: [PATCH 2/7 V2] workqueue: simplify wq_update_unbound

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Message-ID: <20150518202112.GC24861@htj.duckdns.org>
Date:	Mon, 18 May 2015 16:21:12 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7 V2] workqueue: simplify wq_update_unbound_numa()

On Tue, May 12, 2015 at 08:32:30PM +0800, Lai Jiangshan wrote:
> wq_update_unbound_numa() is known be called with wq_pool_mutex held.
> 
> But wq_update_unbound_numa() requests wq->mutex before reading
> wq->unbound_attrs, wq->numa_pwq_tbl[] and wq->dfl_pwq.  But these fields
> were changed to be allowed being read with wq_pool_mutex held.  So we
> simply remove the mutex_lock(&wq->mutex).
> 
> Without the dependence on the the mutex_lock(&wq->mutex), the test
> of wq->unbound_attrs->no_numa can also be moved upward.
> 
> The old code need a long comment to describe the stableness of
> @wq->unbound_attrs which is also guaranteed by wq_pool_mutex now,
> so we don't need this such comment.
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>

Applied 1-2 to wq/for-4.2.

Thanks.

-- 
tejun
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