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

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Message-ID: <1370215895.24311.93.camel@edumazet-glaptop>
Date:	Sun, 02 Jun 2013 16:31:35 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Roman Gushchin <klamm@...dex-team.ru>
Cc:	David Miller <davem@...emloft.net>, paulmck@...ux.vnet.ibm.com,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Dipankar Sarma <dipankar@...ibm.com>, zhmurov@...dex-team.ru,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	David Laight <David.Laight@...LAB.COM>
Subject: Re: [PATCH v2] rcu: fix a race in hlist_nulls_for_each_entry_rcu
 macro

On Thu, 2013-05-30 at 12:25 +0400, Roman Gushchin wrote:
> On 29.05.2013 23:06, Eric Dumazet wrote:
> > On Wed, 2013-05-29 at 14:09 +0400, Roman Gushchin wrote:
> >
> > True, these lookup functions are usually structured the same around the
> > hlist_nulls_for_each_entry_rcu() loop.
> >
> > A barrier() right before the loop seems to be a benefit, the size of
> > assembly code is reduced by 48 bytes.
> >
> > And its one of the documented way to handle this kind of problems
> > (Documentation/atomic_ops.txt line 114)
> >
> > I guess we should amend this documentation, eventually.
> >
> > Thanks, please add you "Signed-off-by" if you agree with the patch.
> >
> 
> Signed-off-by: Roman Gushchin <klamm@...dex-team.ru>
> 
> Many thanks to you, Paul E. McKenney and David Laight for your
> patches, help and participation in this discussion.

Thanks to you !

David, is there any problem with the patch ?

http://patchwork.ozlabs.org/patch/247360/ says "Not applicable", please
tell me what is needed to get it merged.

Thanks !



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