netdev - Re: [RFT 2/4] Add mod_timer

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Date:	Wed, 18 Feb 2009 11:29:47 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	David Miller <davem@...emloft.net>,
	Rick Jones <rick.jones2@...com>,
	Eric Dumazet <dada1@...mosbay.com>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, tglx@...utronix.de,
	Martin Josefsson <gandalf@...g.westbo.se>
Subject: Re: [RFT 2/4] Add mod_timer_noact

Stephen Hemminger wrote:

> +/***
> + * mod_timer_noact - modify a timer's timeout
> + * @timer: the timer to be modified
> + *
> + * mod_timer_noact works like mod_timer except that it doesn't activate an
> + * inactive timer, instead it returns without updating timer->expires.
> + *
> + * The function returns whether it has modified a pending timer or not.
> + * (ie. mod_timer_noact() of an inactive timer returns 0, mod_timer_noact() of
> + * an active timer returns 1.)
> + */
> +int mod_timer_noact(struct timer_list *timer, unsigned long expires)
> +{
> +	BUG_ON(!timer->function);
> +
> +	/*
> +	 * This is a common optimization triggered by the
> +	 * networking code - if the timer is re-modified
> +	 * to be the same thing then just return:
> +	 */
> +	if (timer->expires == expires && timer_pending(timer))
> +		return 1;

This doesn't seem right, since it uses TIMER_NOACT below, there's
no point in checking for timer_pending() I think.

> +
> +	return __mod_timer(timer, expires, TIMER_NOACT);
> +}
> +
> +EXPORT_SYMBOL(mod_timer_noact);
> +

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