linux-kernel - Re: [PATCH tip/core/rcu 05/13] net: add checking to rcu

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Message-ID: <20100214082314.GA12658@elte.hu>
Date:	Sun, 14 Feb 2010 09:23:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH tip/core/rcu 05/13] net: add checking to
 rcu_dereference() primitives


* Eric Dumazet <eric.dumazet@...il.com> wrote:

> Le jeudi 11 f??vrier 2010 ?? 16:00 -0800, Paul E. McKenney a ??crit :
> > Update rcu_dereference() primitives to use new lockdep-based checking.
> > The rcu_dereference() in __in6_dev_get() may be protected either by
> > rcu_read_lock() or RTNL, per Eric Dumazet.  The rcu_dereference()
> > in __sk_free() is protected by the fact that it is never reached if an
> > update could change it.  Check for this by using rcu_dereference_check()
> > to verify that the struct sock's ->sk_wmem_alloc counter is zero.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> CC to netdev and David Miller, network maintainer.
> 
> Acked-by: Eric Dumazet <eric.dumazet@...il.com>
> 
> Thanks Paul, great work !

Dave, does this look good to you too? Cannot pick up the rest of the patchset 
without these checks/annotations into the RCU tree as there's too many 
warnings triggering in the networking code. So it's an all-or-nothing 
patchset in that regard.

Thanks,

	Ingo
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