linux-kernel - [tip:smp/hotplug] s390/smp: Make cpu notifier symetric

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Message-ID: <tip-ef65d45cbfbb438a5fbe8ef3fc424314ff1e8b7c@git.kernel.org>
Date:   Wed, 9 Nov 2016 14:56:32 -0800
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
        bigeasy@...utronix.de, mingo@...nel.org
Subject: [tip:smp/hotplug] s390/smp: Make cpu notifier symetric

Commit-ID:  ef65d45cbfbb438a5fbe8ef3fc424314ff1e8b7c
Gitweb:     http://git.kernel.org/tip/ef65d45cbfbb438a5fbe8ef3fc424314ff1e8b7c
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Fri, 4 Nov 2016 15:41:41 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 9 Nov 2016 23:45:28 +0100

s390/smp: Make cpu notifier symetric

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.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: linux-s390@...r.kernel.org
Cc: rt@...utronix.de
Link: http://lkml.kernel.org/r/20161104144140.lcee6kwmwlx37m7g@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

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

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 35531fe..2a9c03d 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1056,9 +1056,10 @@ static int smp_cpu_notify(struct notifier_block *self, unsigned long action,
 
 	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;
 	}