netdev - Re: [PATCH net 2/2 RESEND] ipmr: Add lockdep expression to ipmr_for_each

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Message-ID: <20200513215441.22653800@canb.auug.org.au>
Date:   Wed, 13 May 2020 21:54:41 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Cc:     kuba@...nel.org, Amol Grover <frextrite@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Joel Fernandes <joel@...lfernandes.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH net 2/2 RESEND] ipmr: Add lockdep expression to
 ipmr_for_each_table macro

Hi all,

On Tue, 12 May 2020 10:47:05 +0530 Madhuparna Bhowmik <madhuparnabhowmik10@...il.com> wrote:
> > 
> > I think what is happening is this:
> > 
> > ipmr_net_init() -> ipmr_rules_init() -> ipmr_new_table()
> > 
> > ipmr_new_table() returns an existing table if there is one, but
> > obviously none can exist at init.  So a better fix would be:
> > 
> > #define ipmr_for_each_table(mrt, net)					\
> > 	list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list,	\
> > 				lockdep_rtnl_is_held() ||		\
> > 				list_empty(&net->ipv4.mr_tables))
> >  
> (adding Stephen)

I have changed the patch in my fixes tree to this.

-- 
Cheers,
Stephen Rothwell

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