netdev - Re: [PATCH] update rwlock initialization for nat

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Date:	Thu, 11 Dec 2008 17:24:32 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dada1@...mosbay.com, mingo@...e.hu, acme@...stprotocols.net,
	davem@...emloft.net
Subject: Re: [PATCH] update rwlock initialization for nat_table



On Thu, 11 Dec 2008, Andrew Morton wrote:

> On Wed, 10 Dec 2008 15:06:00 -0500 (EST)
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > ---------------------------
> > commit d4175059c8f95e4cd58e0efaa85610ca59469fbd
> > Author: Steven Rostedt <srostedt@...hat.com>
> > Date:   Wed Dec 10 15:00:09 2008 -0500
> > 
> >     update rwlock initialization for nat_table
> >     
> >     Impact: clean up
> 
> It's more than a "cleanup"?
> 
> >     The commit e099a173573ce1ba171092aee7bb3c72ea686e59
> >     (netfilter: netns nat: per-netns NAT table) renamed the
> >     nat_table from __nat_table to nat_table without updating the
> >     __RW_LOCK_UNLOCKED(__nat_table.lock).
> >     
> >     Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> > 
> > diff --git a/net/ipv4/netfilter/nf_nat_rule.c b/net/ipv4/netfilter/nf_nat_rule.c
> > index bea54a6..8d489e7 100644
> > --- a/net/ipv4/netfilter/nf_nat_rule.c
> > +++ b/net/ipv4/netfilter/nf_nat_rule.c
> > @@ -61,7 +61,7 @@ static struct
> >  static struct xt_table nat_table = {
> >  	.name		= "nat",
> >  	.valid_hooks	= NAT_VALID_HOOKS,
> > -	.lock		= __RW_LOCK_UNLOCKED(__nat_table.lock),
> > +	.lock		= __RW_LOCK_UNLOCKED(nat_table.lock),
> >  	.me		= THIS_MODULE,
> >  	.af		= AF_INET,
> >  };
> 
> At present any lockdep messages relating to this lock will print the
> wrong name.  So it's a nanobug, I think?

Well, I'm now working on the RT git tree, and it has a much stronger 
requirement on __RW_LOCK_UNLOCK. It actually uses the variable inside.

For mainline, it is a nanobug, but for -rt it is a compiler error. Since 
it is still a clean up, it would be nice to have it in mainline ;-)

-- Steve

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