linux-kernel - Re: [PATCH] rcu: fix a race in hlist_nulls_for_each_entry

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Message-ID: <519B9809.1010408@yandex-team.ru>
Date:	Tue, 21 May 2013 19:51:37 +0400
From:	Roman Gushchin <klamm@...dex-team.ru>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	paulmck@...ux.vnet.ibm.com, Dipankar Sarma <dipankar@...ibm.com>,
	zhmurov@...dex-team.ru, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] rcu: fix a race in hlist_nulls_for_each_entry_rcu macro

On 21.05.2013 19:38, Eric Dumazet wrote:
> On Tue, 2013-05-21 at 18:47 +0400, Roman Gushchin wrote:
>
>> This code has the same mistake: it is rcu_dereference_raw(head->first),
>> so there is nothing that prevents gcc to store the (head->first) value
>> in a register.
>
> If other rcu accessors have the same problem, a more complete patch is
> needed.

Ok, I'll try to provide a complete patch ASAP.

>
> Thanks
>
>
>

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