linux-kernel - Re: [take3 4/4] kevent: poll/select() notifications. Timer notifications.

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Date:	Thu, 3 Aug 2006 11:43:02 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>
Subject: Re: [take3 4/4] kevent: poll/select() notifications. Timer notifications.

On Thursday 03 August 2006 11:46, Evgeniy Polyakov wrote:
> poll/select() notifications. Timer notifications.
>
> +++ b/kernel/kevent/kevent_poll.c

> +static int kevent_poll_wait_callback(wait_queue_t *wait,
> +		unsigned mode, int sync, void *key)
> +{
> +	struct kevent_poll_wait_container *cont =
> +		container_of(wait, struct kevent_poll_wait_container, wait);
> +	struct kevent *k = cont->k;
> +	struct file *file = k->st->origin;
> +	unsigned long flags;
> +	u32 revents, event;
> +
> +	revents = file->f_op->poll(file, NULL);
> +	spin_lock_irqsave(&k->ulock, flags);
> +	event = k->event.event;
> +	spin_unlock_irqrestore(&k->ulock, flags);

Not sure why you take a spinlock just to read a u32

Eric
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