linux-kernel - Re: call_rcu from trace

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Message-ID: <20150616115240.75f9187b@gandalf.local.home>
Date:	Tue, 16 Jun 2015 11:52:40 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Daniel Wagner <wagi@...om.org>
Cc:	paulmck@...ux.vnet.ibm.com, Alexei Starovoitov <ast@...mgrid.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: call_rcu from trace_preempt

On Tue, 16 Jun 2015 11:41:51 -0400
Steven Rostedt <rostedt@...dmis.org> 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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