linux-kernel - Re: [PATCH 30/38] net/bridge: Use time_before, time_before

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Message-ID: <20071224092245.57b1397e@deepthought>
Date:	Mon, 24 Dec 2007 09:22:45 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Julia Lawall <julia@...u.dk>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 30/38] net/bridge: Use time_before, time_before_eq, etc.

On Mon, 24 Dec 2007 15:45:32 +0100 (CET)
Julia Lawall <julia@...u.dk> wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> The functions time_before, time_before_eq, time_after, and time_after_eq
> are more robust for comparing jiffies against other values.
> 
> A simplified version of the semantic patch making this change is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @ change_compare_np @
> expression E;
> @@
> 
> (
> - jiffies <= E
> + time_before_eq(jiffies,E)
> |
> - jiffies >= E
> + time_after_eq(jiffies,E)
> |
> - jiffies < E
> + time_before(jiffies,E)
> |
> - jiffies > E
> + time_after(jiffies,E)
> )
> 
> @ include depends on change_compare_np @
> @@
> 
> #include <linux/jiffies.h>
> 
> @ no_include depends on !include && change_compare_np @
> @@
> 
>   #include <linux/...>
> + #include <linux/jiffies.h>
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> ---
> 
> diff -r -u -p a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
> --- a/net/bridge/br_netfilter.c	2007-11-15 15:09:37.000000000 +0100
> +++ b/net/bridge/br_netfilter.c	2007-12-23 20:30:40.000000000 +0100
> @@ -46,6 +46,7 @@
>  #include "br_private.h"
>  #ifdef CONFIG_SYSCTL
>  #include <linux/sysctl.h>
> +#include <linux/jiffies.h>
>  #endif
>  
>  #define skb_origaddr(skb)	 (((struct bridge_skb_cb *) \
> @@ -221,7 +222,7 @@ static void __br_dnat_complain(void)
>  {
>  	static unsigned long last_complaint;
>  
> -	if (jiffies - last_complaint >= 5 * HZ) {
> +	if (time_before_eq(jiffies, last_complaint + 5 * HZ)) {
>  		printk(KERN_WARNING "Performing cross-bridge DNAT requires IP "
>  		       "forwarding to be enabled\n");
>  		last_complaint = jiffies;

I would recommend changing this to net_ratelimit() instead.


-- 
Stephen Hemminger <stephen.hemminger@...tta.com>
--
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