linux-kernel - [PATCH tip/core/rcu 7/7] rcu: Tone down debugging during boot-up and shutdown.

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Message-Id: <1363641416-18642-7-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Mon, 18 Mar 2013 14:16:56 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, edumazet@...gle.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 7/7] rcu: Tone down debugging during boot-up and shutdown.

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

In some situations, randomly delaying RCU grace-period initialization
can cause more trouble than help.  This commit therefore restricts this
type of RCU self-torture to runtime, giving it a rest during boot and
shutdown.

Reported-by: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcutree.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 71df6f9..0e52250 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1319,7 +1319,8 @@ static int rcu_gp_init(struct rcu_state *rsp)
 					    rnp->grphi, rnp->qsmask);
 		raw_spin_unlock_irq(&rnp->lock);
 #ifdef CONFIG_PROVE_RCU_DELAY
-		if ((random32() % (rcu_num_nodes * 8)) == 0)
+		if ((random32() % (rcu_num_nodes * 8)) == 0 &&
+		    system_state == SYSTEM_RUNNING)
 			schedule_timeout_uninterruptible(2);
 #endif /* #ifdef CONFIG_PROVE_RCU_DELAY */
 		cond_resched();
-- 
1.8.1.5

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