netdev - Re: [PATCH] netfilter: xtables: stackptr should be percpu

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Message-ID: <alpine.LSU.2.01.1005311519340.25402@obet.zrqbmnf.qr>
Date:	Mon, 31 May 2010 15:22:24 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Xiaotian Feng <dfeng@...hat.com>, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH] netfilter: xtables: stackptr should be percpu


On Monday 2010-05-31 15:13, Eric Dumazet wrote:
>
>All cpus share a single cache line for their 'stackptr' storage,
>introduced in commit f3c5c1bfd4
>
>This is a stable candidate (2.6.34)

Stackptr was first introduced for 2.6.35-rcX.

>+	i->stackptr = alloc_percpu(unsigned int);
> 	if (i->stackptr == NULL)
> 		return -ENOMEM;
>-	memset(i->stackptr, 0, size);
> 
> 	size = sizeof(void **) * nr_cpu_ids;
> 	if (size > PAGE_SIZE)

Are alloc_percpu areas cleared?

Acked-By: Jan Engelhardt <jengelh@...ozas.de>

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