From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Tue, 18 Aug 2015 19:17:29 +0000 (-0700)
Subject: rcu: Enable stall warnings for synchronize_rcu_expedited()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b08517c76d764c373c232cd309ed058c98705219;p=linux-beck.git

rcu: Enable stall warnings for synchronize_rcu_expedited()

This commit redirects synchronize_rcu_expedited()'s wait to
synchronize_sched_expedited_wait(), thus enabling RCU CPU
stall warnings.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 7b61cece80c0..ffeb99e550e8 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -761,8 +761,7 @@ void synchronize_rcu_expedited(void)
 
 	/* Wait for snapshotted ->blkd_tasks lists to drain. */
 	rnp = rcu_get_root(rsp);
-	wait_event(rsp->expedited_wq,
-		   sync_rcu_preempt_exp_done(rnp));
+	synchronize_sched_expedited_wait(rsp);
 
 	/* Clean up and exit. */
 	rcu_exp_gp_seq_end(rsp);