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

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Message-ID: <alpine.DEB.1.10.0811221831550.19456@alien.or.mcafeemobile.com>
Date:	Sat, 22 Nov 2008 18:35:38 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Tejun Heo <htejun@...il.com>
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

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?


- Davide

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