Re: [PATCH] debug work struct cancel deadlocks with lockdep

[Johannes Berg <johannes@sipsolutions.net>]

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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