From 04d045a681122c806e4f17754ed48e2b19af5d80 Mon Sep 17 00:00:00 2001 From: Richard Cochran Date: Wed, 13 Jul 2016 17:16:49 +0000 Subject: metag/perf: Convert to hotplug state machine Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Signed-off-by: Richard Cochran Signed-off-by: Anna-Maria Gleixner Reviewed-by: Sebastian Andrzej Siewior Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: James Hogan Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-metag@vger.kernel.org Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153336.717395164@linutronix.de Signed-off-by: Ingo Molnar --- arch/metag/kernel/perf/perf_event.c | 26 +++++++------------------- 1 file changed, 7 insertions(+), 19 deletions(-) (limited to 'arch/metag') diff --git a/arch/metag/kernel/perf/perf_event.c b/arch/metag/kernel/perf/perf_event.c index 33a365f924be..052cba23708c 100644 --- a/arch/metag/kernel/perf/perf_event.c +++ b/arch/metag/kernel/perf/perf_event.c @@ -806,25 +806,16 @@ static struct metag_pmu _metag_pmu = { }; /* PMU CPU hotplug notifier */ -static int metag_pmu_cpu_notify(struct notifier_block *b, unsigned long action, - void *hcpu) +static int metag_pmu_starting_cpu(unsigned int cpu) { - unsigned int cpu = (unsigned int)hcpu; struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); - if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING) - return NOTIFY_DONE; - memset(cpuc, 0, sizeof(struct cpu_hw_events)); raw_spin_lock_init(&cpuc->pmu_lock); - return NOTIFY_OK; + return 0; } -static struct notifier_block metag_pmu_notifier = { - .notifier_call = metag_pmu_cpu_notify, -}; - /* PMU Initialisation */ static int __init init_hw_perf_events(void) { @@ -876,16 +867,13 @@ static int __init init_hw_perf_events(void) metag_out32(0, PERF_COUNT(0)); metag_out32(0, PERF_COUNT(1)); - for_each_possible_cpu(cpu) { - struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); + cpuhp_setup_state(CPUHP_AP_PERF_METAG_STARTING, + "AP_PERF_METAG_STARTING", metag_pmu_starting_cpu, + NULL); - memset(cpuc, 0, sizeof(struct cpu_hw_events)); - raw_spin_lock_init(&cpuc->pmu_lock); - } - - register_cpu_notifier(&metag_pmu_notifier); ret = perf_pmu_register(&pmu, metag_pmu->name, PERF_TYPE_RAW); -out: + if (ret) + cpuhp_remove_state_nocalls(CPUHP_AP_PERF_METAG_STARTING); return ret; } early_initcall(init_hw_perf_events); -- cgit v1.2.3