[PATCH 1/2] s390/cpum_cf: Fix missing cpu hotplug notifier transition

From	Anna-Maria Gleixner <anna-maria@linutronix.de>
Newsgroups	linux.kernel
Subject	[PATCH 1/2] s390/cpum_cf: Fix missing cpu hotplug notifier transition
Date	2016-03-11 12:00 +0100
Message-ID	<rbsXw-4QJ-15@gated-at.bofh.it> (permalink)
References	<rbsXw-4QJ-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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The cpumf_pmu_notfier() hotplug callback lacks handling of the
CPU_DOWN_FAILED case. That means, if CPU_DOWN_PREPARE failes, the PMC
of the CPU is not setup again.

Add handling for CPU_DOWN_FAILED transition to setup the PMC of the
CPU.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-s390@vger.kernel.org
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
---
 arch/s390/kernel/perf_cpum_cf.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -670,6 +670,7 @@ static int cpumf_pmu_notifier(struct not
 
 	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_ONLINE:
+	case CPU_DOWN_FAILED:
 		flags = PMC_INIT;
 		smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1);
 		break;

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[PATCH 1/2] s390/cpum_cf: Fix missing cpu hotplug notifier transition Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-03-11 12:00 +0100

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