linux-kernel - Re: [PATCH v2] rcu: fix a race in hlist_nulls_for_each_entry

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Message-ID: <1369787693.3301.586.camel@edumazet-glaptop>
Date:	Tue, 28 May 2013 17:34:53 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Roman Gushchin <klamm@...dex-team.ru>,
	Jesper Dangaard Brouer <brouer@...hat.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 v2] rcu: fix a race in hlist_nulls_for_each_entry_rcu
 macro

On Tue, 2013-05-28 at 13:10 +0400, Roman Gushchin wrote:
> On 28.05.2013 04:12, Eric Dumazet wrote:

> > Adding a barrier() is probably what we want.
> 
> I agree, inserting barrier() is also a correct and working fix.

Yeah, but I can not find a clean way to put it inside the "for (;;)"

for (barrier();;)  ->

error: expected expression before ‘__asm__’

No user currently does :

if (condition)
	hlist_nulls_for_each_entry_rcu(tpos, pos, head, member)

But who knows...


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