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Commit 81e59494 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Tone down debugging during boot-up and shutdown. 



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: default avatarSasha Levin <sasha.levin@oracle.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 6231069b

kernel/rcutree.c

+2 −1
Original line number Diff line number Diff line
@@ -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();