linux-kernel - Re: [PATCH] memstick: add support for legacy memorysticks

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Date:	Mon, 24 Sep 2012 11:25:11 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Dubov <oakad@...oo.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memstick: add support for legacy memorysticks

Hello,

On Mon, Sep 24, 2012 at 08:19:28PM +0200, Maxim Levitsky wrote:
> Except that if I schedule a same work item few times, these work items
> will be 'processed' in parallel, although there is just one work to do,
> work of pulling the requests from block queue until it has them, and
> dispatching them through my code.
> Or I can get a guarantee that work items wont be processed in parallel?

You need to use system_nrt_wq for that before 3.7-rc1.  After 3.7-rc1,
any workqueue will guarantee that.

> Stiil, even with that only first work item will do the actual work,
> others will wake the workqueue for nothing, but I am ok with that.

It's just like waking up spuriously.  The work item is guaranteed to
be executed at least once after any given schedule/queue_work() call.

Thanks.

-- 
tejun
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