netdev - Re: [PATCH v3 net-next-2.6] netfilter: x_tables: dont block BH while reading counters

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Message-ID: <1292529519.2655.4.camel@edumazet-laptop>
Date:	Thu, 16 Dec 2010 20:58:39 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Jesper Dangaard Brouer <hawk@...x.dk>,
	Patrick McHardy <kaber@...sh.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [PATCH v3 net-next-2.6] netfilter: x_tables: dont block BH
 while reading counters

Le jeudi 16 décembre 2010 à 09:57 -0800, Stephen Hemminger a écrit :
> On Thu, 16 Dec 2010 18:53:06 +0100
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > @@ -759,7 +742,7 @@ static struct xt_counters *alloc_counters(const struct xt_table *table)
> >  	 * about).
> >  	 */
> >  	countersize = sizeof(struct xt_counters) * private->number;
> > -	counters = vmalloc(countersize);
> > +	counters = vzalloc(countersize);
> >  
> >  	if (counters == NULL)
> >  		return ERR_PTR(-ENOMEM);
> > @@ -1007,7 +990,7 @@ static int __do_replace(struct net *net, const char *name,
> >  	struct arpt_entry *iter;
> >  
> >  	ret = 0;
> > -	counters = vmalloc(num_counters * sizeof(struct xt_counters));
> > +	counters = vzalloc(num_counters * sizeof(struct xt_counters));
> >  	if (!counters) {
> >  		ret = -ENOMEM;
> >  		goto out;
> 
> This seems like a different and unrelated change.
> 

Since you later Acked the patch, you probably know that we now provide
to get_counters() a zeroed area, since we do a sum for each possible
cpu, I am answering anyway for other readers ;)

Thanks for reviewing !


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