From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Fri, 21 Jun 2013 13:24:56 +0000 (-0700)
Subject: rcu: Make rcutorture emit online failures if verbose
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7a6a41073c345ff5ef5e81317211481c0da3f7f3;p=linux-beck.git

rcu: Make rcutorture emit online failures if verbose

Although rcutorture counts CPU-hotplug online failures, it does
not explicitly record which CPUs were having trouble coming online.
This commit therefore emits a console message when online failure occurs.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
---

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 20ce3b6f9aa6..be63101c6175 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -1434,7 +1434,13 @@ rcu_torture_onoff(void *arg)
 					 torture_type, cpu);
 			starttime = jiffies;
 			n_online_attempts++;
-			if (cpu_up(cpu) == 0) {
+			ret = cpu_up(cpu);
+			if (ret) {
+				if (verbose)
+					pr_alert("%s" TORTURE_FLAG
+						 "rcu_torture_onoff task: online %d failed: errno %d\n",
+						 torture_type, cpu, ret);
+			} else {
 				if (verbose)
 					pr_alert("%s" TORTURE_FLAG
 						 "rcu_torture_onoff task: onlined %d\n",