linux-kernel - Re: [PATCH 2/3] workqueue, async: implement work/async_current

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Message-ID: <20130118025936.GJ16568@mtj.dyndns.org>
Date:	Thu, 17 Jan 2013 18:59:36 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Ming Lei <ming.lei@...onical.com>,
	Alex Riesen <raa.lkml@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Jens Axboe <axboe@...nel.dk>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 2/3] workqueue, async: implement work/async_current_func()

Hello, Linus.

On Thu, Jan 17, 2013 at 06:47:48PM -0800, Linus Torvalds wrote:
> On Thu, Jan 17, 2013 at 5:25 PM, Tejun Heo <tj@...nel.org> wrote:
> > Implement work/async_current_func() which query whether the current
> > task is a workqueue or async worker respectively and, if so, return
> > the current function being executed along with work / async item
> > related information.
> 
> So why the odd interface? The only user of it calls it with a

Yeah, I was doing something else in async and arguing between that and
current_is_async() and ended up keeping it as it was consistent with
the workqueue counterpart.

> NULL/NULL pair of arguments, and in general it's just way too complex
> to be an exported function at all. I *suspect* you chose that complex
> interface because you feel you may have some use for it inside of the
> async code itself, but why isn't that then not totally private to
> there?
> 
> IOW, why isn't the interface just
> 
>    static struct worker *current_worker(void)
>    {
>       if (current->flags & PF_WQ_WORKER)
>          return kthread_data(current);
>       return NULL;
>    }

I'd prefer to keep struct worker inside workqueue.c, so how about
keeping the workqueue part and make async part current_is_async()?

Thanks.

-- 
tejun
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