linux-kernel - [PATCH RFC tip/core/rcu 4/5] rcutorture: Suppress spurious RCU CPU stall warnings

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Date:	Fri, 20 Jun 2014 11:33:22 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com,
	oleg@...hat.com, sbw@....edu,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Christoph Lameter <cl@...two.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH RFC tip/core/rcu 4/5] rcutorture: Suppress spurious RCU CPU stall warnings

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>

Because rcutorture runs CPU-bound in the kernel, it can prevent grace
periods from being reported.  In RCU_COND_RESCHED_QS=y builds, the
cond_resched() calls handle this reporting.  This commit therefore
forces RCU_COND_RESCHED_QS=y for the TREE01 rcutorture configuration,
which is otherwise prone to spurious RCU CPU stall warnings.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Josh Triplett <josh@...htriplett.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Christoph Lameter <cl@...two.org>
Cc: Mike Galbraith <umgwanakikbuti@...il.com>
Cc: Eric Dumazet <eric.dumazet@...il.com>
---
 tools/testing/selftests/rcutorture/configs/rcu/TREE01 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TREE01 b/tools/testing/selftests/rcutorture/configs/rcu/TREE01
index 9c827ec59a97..82e70bc38125 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/TREE01
+++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE01
@@ -4,6 +4,7 @@ CONFIG_PREEMPT_NONE=n
 CONFIG_PREEMPT_VOLUNTARY=n
 CONFIG_PREEMPT=y
 #CHECK#CONFIG_TREE_PREEMPT_RCU=y
+CONFIG_RCU_COND_RESCHED_QS=y
 CONFIG_HZ_PERIODIC=n
 CONFIG_NO_HZ_IDLE=y
 CONFIG_NO_HZ_FULL=n
-- 
1.8.1.5

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