linux-kernel - Re: [PATCH] workqueues: insert_work: use "list

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Date:	Fri, 13 Jun 2008 00:24:58 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jarek Poplawski <jarkao2@...pl>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueues: insert_work: use "list_head *" instead of
	"int tail"

On Thu, Jun 12, 2008 at 08:55:50PM +0400, Oleg Nesterov wrote:
> On 06/12, Oleg Nesterov wrote:
> >
> > insert_work() inserts the new work_struct before or after cwq->worklist,
> > depending on the "int tail" parameter. Change it to accept "list_head *"
> > instead, this shrinks .text a bit and allows us to insert the barrier
> > after specific work_struct.
> 
> This allows us to implement
> 
> 	int flush_work(struct work_struct *work)
> 	{
...
> 	}
> 
> suggested by Peter. It only waits for selected work_struct.
> 
> I doubt it will have a lot of users though. In most cases we need
> cancel_work_sync() and nothing more.

I guess it could've had enough users if it were done a bit sooner...

I didn't check this implementation yet, but if it's "rtnl_lock in
other works" safe then it could've been used in David Miller's fresh
patch replacing last uses of flush_scheduled_work() in net drivers'
->stop() etc (thread: "Re: 2.6.25rc7 lockdep trace") - there would
be far less doubts about possible change of functionality.

Anyway, this idea looks right to me.

Thanks,
Jarek P.
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