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

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Date:	Tue, 21 May 2013 08:38:13 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Roman Gushchin <klamm@...dex-team.ru>
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 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.

Thanks



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