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Date:	Tue, 16 Jun 2015 11:52:40 -0400
From:	Steven Rostedt <>
To:	Daniel Wagner <>
Cc:, Alexei Starovoitov <>,
	Daniel Wagner <>,
	LKML <>
Subject: Re: call_rcu from trace_preempt

On Tue, 16 Jun 2015 11:41:51 -0400
Steven Rostedt <> wrote:

> >  	if (l) {
> >  		hlist_del_rcu(&l->hash_node);
> >  		htab->count--;
> > -		kfree_rcu(l, rcu);
> > +		/* kfree_rcu(l, rcu); */
> So this kfree_rcu() is only being used to defer a free, and has nothing
> to do with having to free 'l' from rcu?

If you still require kfree_rcu() but can not call it here, still use an
irq_work, and have the irq_work handler call kfree_rcu().

-- Steve
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