linux-kernel - Re: [PATCH tip/core/rcu 0/8] rcu: add lockdep-based diagnostics to rcu

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Date:	Wed, 13 Jan 2010 17:37:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	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
Subject: Re: [PATCH tip/core/rcu 0/8] rcu: add lockdep-based diagnostics to
 rcu_dereference()


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> On Wed, Jan 13, 2010 at 10:22:42AM +0100, Ingo Molnar wrote:
> > 
> > FYI, i'm getting various runtime warnings triggered by the new RCU checks:
> > 
> >  [   20.630034] WARNING: at net/core/sock.c:1076 __sk_free+0x108/0x140()
> > 
> > bootlog and config attached.
> 
> Gah!!!  I forgot to label the RCU-lockdep stuff "RFC"!!!  Could you
> please rewind tip/core/rcu back to b6407e8639 ("rcu: Give different
> levels of the rcu_node hierarchy distinct lockdep names")?

Sure - i have done that.

> I have fixes for many of the warnings below, both as modifications to uses 
> of RCU and as modifications to the check code itself.  But I have been 
> building a new patchsets rather than keeping patches on top of this 
> patchset.  I also have modifications in the works to ease transition, for 
> example, but having a separate CONFIG_PROVE_RCU.

Sure, no problem!

	Ingo
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