linux-kernel - Re: poll: allow f_op->poll to sleep, take #3

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Message-ID: <4928C891.80405@gmail.com>
Date:	Sun, 23 Nov 2008 12:05:53 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Davide Libenzi <davidel@...ilserver.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <matthew@....cx>,
	Miklos Szeredi <miklos@...redi.hu>, arjan@...ux.intel.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	hch@...radead.org, Ingo Molnar <mingo@...e.hu>,
	rminnich@...dia.gov, ericvh@...il.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: poll: allow f_op->poll to sleep, take #3

Davide Libenzi wrote:
> On Sun, 23 Nov 2008, Tejun Heo wrote:
> 
>> +static int pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
>> +{
>> +	struct poll_wqueues *pwq = wait->private;
>> +	DECLARE_WAITQUEUE(dummy_wait, pwq->polling_task);
>> +
>> +	set_mb(pwq->triggered, 1);
>> +
>> +	/* perform the default wake up operation */
>> +	return default_wake_function(&dummy_wait, mode, sync, key);
>> +}
> 
> Wouldn't it be nicer to un-static try_to_wake_up() (or a wrapper) instead 
> of setting up a fake wait queue just to use default_wake_function(), just 
> to wake up a task?

I thought try_to_wake_up() was made static to avoid abuse but then again
creating dummy waitqueue is an obvious abuse of waitqueue.  What do
other people think?  I'll be happy to use try_to_wake_up() directly.

Thanks.

-- 
tejun
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