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@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: linux-s390@xxxxxxxxxxxxxxx
Signed-off-by: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx>
---
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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