linux-kernel - Re: [PATCH 05/11 V5] workqueue: Add @bind arguement back without change any thing

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Date:	Thu, 06 Sep 2012 09:04:06 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11 V5] workqueue: Add @bind arguement back without
 change any thing

On 09/06/2012 03:49 AM, Tejun Heo wrote:
> Hello,
> 
> On Wed, Sep 05, 2012 at 06:37:42PM +0800, Lai Jiangshan wrote:
>> Ensure the gcwq->flags is only accessed with gcwq->lock held.
>> And make the code more easier to understand.
>>
>> In all current callsite of create_worker(), DISASSOCIATED can't
>> be flipped while create_worker().
>> So the whole behavior is unchanged with this patch.
> 
> This doesn't change anything.  You're just moving the test to the
> caller with comments there explaining how it won't change even if
> gcwq->lock is released.  It seems more confusing to me.  The flag is
> still protected by manager_mutex.  How is this an improvement?
> 

Some other bit of gcwq->flags is accessed(modified) without manager_mutex.
making gcwq->flags be accessed only form gcwq->lock C.S. will help the reviewer.

I don't like adding special things/code when not-absolutely-required.

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