From: Anna-Maria Gleixner Date: Fri, 11 Mar 2016 10:52:38 +0000 (+0100) Subject: s390/cpum_sf: Fix cpu hotplug notifier transitions X-Git-Tag: v4.14-rc1~3506^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1e3c1dd15dd30232458e35128fd062b788b1c9e4;p=platform%2Fkernel%2Flinux-rpi.git s390/cpum_sf: Fix cpu hotplug notifier transitions 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. Furthermore the CPU_ONLINE_FROZEN case will never be processed because of masking the switch expression with CPU_TASKS_FROZEN. Add handling for CPU_DOWN_FAILED transition to setup the PMC of the CPU. Remove CPU_ONLINE_FROZEN case. Signed-off-by: Anna-Maria Gleixner Acked-by: Hendrik Brueckner Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index 1a43474..eaab9a7 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -1521,7 +1521,7 @@ static int cpumf_pmu_notifier(struct notifier_block *self, switch (action & ~CPU_TASKS_FROZEN) { case CPU_ONLINE: - case CPU_ONLINE_FROZEN: + case CPU_DOWN_FAILED: flags = PMC_INIT; smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1); break;