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Message-Id: <1183625448.3818.6.camel@johannes.berg>
Date: Thu, 05 Jul 2007 10:50:48 +0200
From: Johannes Berg <johannes@...solutions.net>
To: Ingo Molnar <mingo@...e.hu>
Cc: Linux Kernel list <linux-kernel@...r.kernel.org>,
Oleg Nesterov <oleg@...sign.ru>,
Arjan van de Ven <arjan@...radead.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Thomas Sattler <tsattler@....de>
Subject: Re: [PATCH] debug work struct cancel deadlocks with lockdep
On Thu, 2007-07-05 at 10:45 +0200, Ingo Molnar wrote:
> > +#ifdef CONFIG_LOCKDEP
> > + /*
> > + * It is permissible to free the struct work_struct
> > + * from inside the function that is called from it,
> > + * this we need to take into account for lockdep too.
> > + * To avoid bogus "held lock freed" warnings as well
> > + * as problems when looking into work->lockdep_map,
> > + * make a copy and use that here.
> > + */
> > + struct lockdep_map lockdep_map = work->lockdep_map;
> > +#endif
>
> > + lock_acquire(&lockdep_map, 0, 0, 0, 2, _THIS_IP_);
> > f(work);
> > + lock_release(&lockdep_map, 1, _THIS_IP_);
>
> neat trick :)
Not like I had a choice ;) But since I assign .key it still works :)
Btw, do you have a tree you'll submit this through, or Oleg, or should I
send it to akpm after we sort out any further issues?
johannes
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