Re: [PATCH arm 1/1] arm: Use _rcuidle tracepoint to allow use from idle

Paul E. McKenney
2016-04-26T21:08:32Z

On Tue, Apr 26, 2016 at 04:52:17PM -0400, Steven Rostedt wrote:
> On Tue, 26 Apr 2016 13:46:15 -0700
> Tony Lindgren <tony@atomide.com> wrote:
>
>
> > [ INFO: suspicious RCU usage. ]
> > 4.6.0-rc5-next-20160426+ #1127 Not tainted
> > -------------------------------
> > include/trace/events/clk.h:45 suspicious rcu_dereference_check() usage!
> >
> > other info that might help us debug this:
> >
> >
> > RCU used illegally from idle CPU!
> > rcu_scheduler_active = 1, debug_locks = 0
> > RCU used illegally from extended quiescent state!
> > 2 locks held by swapper/0/0:
> > #0: (&oh->hwmod_key#30){......}, at: [<c0121afc>] omap_hwmod_enable+0x18/0x44
> > #1: (enable_lock){......}, at: [<c0630684>] clk_enable_lock+0x18/0x124
> >
>
> Hah! I knew that mole would show up.

There do seem to be quite a few candidate moles, don't there?

Thanx, Paul