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Date: Thu, 16 Jul 2015 18:51:39 +0100
From: Mel Gorman <mgorman@suse.de>
To: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>, nicstange@gmail.com,
        Linux Memory Management List <linux-mm@kvack.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        LKP <lkp@01.org>
Subject: Re: [mminit] [ INFO: possible recursive locking detected ]
Message-ID: <20150716175139.GB2561@suse.de>
References: <20150714000910.GA8160@wfg-t540p.sh.intel.com>
 <20150714103108.GA6812@suse.de>
 <CALYGNiMUXMvvvi-+64Nd6Qb8Db2EiGZ26jbP8yotUHWS4uF1jg@mail.gmail.com>
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On Thu, Jul 16, 2015 at 08:13:38PM +0300, Konstantin Khlebnikov wrote:
> > @@ -1187,14 +1195,14 @@ void __init page_alloc_init_late(void)
> >  {pgdat_init_rwsempgdat_init_rwsempgdat_init_rwsem
> >         int nid;
> >
> > +       /* There will be num_node_state(N_MEMORY) threads */
> > +       atomic_set(&pgdat_init_n_undone, num_node_state(N_MEMORY));
> >         for_each_node_state(nid, N_MEMORY) {
> > -               down_read(&pgdat_init_rwsem);
> 
> Rw-sem have special "non-owner" mode for keeping lockdep away.
> This should be enough:
> 

I think in this case that the completions look nicer though so I think
I'll keep them.

-- 
Mel Gorman
SUSE Labs