linux-kernel - rcutorture: Consider FROZEN hotplug notifier transitions

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Date:	Thu, 17 Mar 2016 11:14:35 +0100
From:	Anna-Maria Gleixner <anna-maria@...utronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	rt@...utronix.de, Anna-Maria Gleixner <anna-maria@...utronix.de>,
	Josh Triplett <josh@...htriplett.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: rcutorture: Consider FROZEN hotplug notifier transitions

The hotplug notifier rcutorture_cpu_notify() doesn't consider the
corresponding CPU_XXX_FROZEN transitions. They occure on
suspend/resume and are usually handled the same way as the
corresponding non frozen transitions.

Mask the switch case action argument with '~CPU_TASKS_FROZEN' to map
CPU_XXX_FROZEN hotplug transitions on corresponding non frozen
transitions.

Cc: Josh Triplett <josh@...htriplett.org>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
---
 kernel/rcu/rcutorture.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1598,7 +1598,7 @@ static int rcutorture_cpu_notify(struct
 {
 	long cpu = (long)hcpu;
 
-	switch (action) {
+	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_ONLINE:
 	case CPU_DOWN_FAILED:
 		(void)rcutorture_booster_init(cpu);