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Date:	Mon, 13 Jan 2014 00:20:33 -0800
From:	Eric Dumazet <>
To:	Cong Wang <>
Cc:	Tom Herbert <>, netdev <>
Subject: Re: suspicious RCU usage in net/ipv4/ip_tunnel.c:80

On Sun, 2014-01-12 at 22:36 -0800, Cong Wang wrote:
> > Please read rcu_dereference_protected() documentation in
> > include/linux/rcupdate.h
> I did before I replied.

> >
> > Also you can run sparse, with CONFIG_SPARSE_RCU_POINTER=y in
> > your .config
> >
> > make C=2 net/ipv4/ip_tunnel.o
> >
> > And then you'll know the answer to this question.
> >
> Sounds like it is only to shut up a sparse warning, then its name
> is misleading, we clearly don't dereference it here.

Historical reasons, you should have been there when Paul invented the
name and lazy people like us let him do so !

You are lucky, there is plenty of documentation, maybe too much..

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