linux-kernel - [PATCH 10/25 v2] s390/smp: Make cpu notifier symetric

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Message-ID: <20161104144140.lcee6kwmwlx37m7g@linutronix.de>
Date:   Fri, 4 Nov 2016 15:41:41 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     linux-kernel@...r.kernel.org, rt@...utronix.de,
        Thomas Gleixner <tglx@...utronix.de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-s390@...r.kernel.org
Subject: [PATCH 10/25 v2] s390/smp: Make cpu notifier symetric

From: Thomas Gleixner <tglx@...utronix.de>

There is no reason to remove the sysfs cpu files when the CPU is dead, they
can be removed when the cpu is prepared to go down. Doing it at
DOWN_PREPARE allows us to convert it to a symetric hotplug state in the
next step.

Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: linux-s390@...r.kernel.org
Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
v1…v2: s/::/

 arch/s390/kernel/smp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1056,9 +1056,10 @@ static int smp_cpu_notify(struct notifie
 
 	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_ONLINE:
+	case CPU_DOWN_FAILED:
 		err = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
 		break;
-	case CPU_DEAD:
+	case CPU_DOWN_PREPARE:
 		sysfs_remove_group(&s->kobj, &cpu_online_attr_group);
 		break;
 	}