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

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Message-ID: <20100113161721.GC6803@linux.vnet.ibm.com>
Date:	Wed, 13 Jan 2010 08:17:21 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
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()

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")?

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.

Please accept my apologies for the mislabeling!!!

							Thanx, Paul

> Thanks,
> 
> 	Ingo

> #
> # Automatically generated make config: don't edit
> # Linux kernel version: 2.6.33-rc4
> # Wed Jan 13 11:44:27 2010
> #
> # CONFIG_64BIT is not set
> CONFIG_X86_32=y
> # CONFIG_X86_64 is not set
> CONFIG_X86=y
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