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Date: Tue, 22 Dec 2015 15:46:49 +0100 From: Sebastian Andrzej Siewior <sebastian@...akpoint.cc> To: Philipp Schrader <philipp@...oton-tech.com> Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, tglx@...utronix.de, paulmck@...ux.vnet.ibm.com, rostedt@...dmis.org Subject: Re: [PATCH v3] tracing: Fix rcu splat from idle CPU on boot. On 2015-12-14 11:07:09 [-0800], Philipp Schrader wrote: > With PREEMPT_RT and most of the lockdep-related options enabled I > encountered this splat when booting our DRA7 evaluation module: > > [ 0.055073] > [ 0.055076] =============================== > [ 0.055079] [ INFO: suspicious RCU usage. ] > [ 0.055084] 4.1.6+ #2 Not tainted > [ 0.055086] ------------------------------- > [ 0.055090] include/trace/events/hist.h:31 suspicious > rcu_dereference_check() usage! … > As per Steve Rotstedt's suggestion I changed the trace_* calls to > trace_*_rcuidle calls. He pointed out that the trace points were getting > triggered when rcu wasn't watching. > > Signed-off-by: Philipp Schrader <philipp@...oton-tech.com> > Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> I'm taking this for -RT. Is my assumption correct, that this goes into the v4.5 merge window once everybody is back from holidays? Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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