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Groups > linux.kernel > #1446165

[tip:smp/hotplug] hwtracing/coresight-etm3x: Convert to hotplug state machine

From tip-bot for Richard Cochran <tipbot@zytor.com>
Newsgroups linux.kernel
Subject [tip:smp/hotplug] hwtracing/coresight-etm3x: Convert to hotplug state machine
Date 2016-07-19 09:30 +0200
Message-ID <rWxDA-15B-43@gated-at.bofh.it> (permalink)
References <rUw8X-67L-47@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Commit-ID:  2b5283d12f678391616718229aeabeca47497db5
Gitweb:     http://git.kernel.org/tip/2b5283d12f678391616718229aeabeca47497db5
Author:     Richard Cochran <rcochran@linutronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:54 +0000
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 15 Jul 2016 10:40:29 +0200

hwtracing/coresight-etm3x: Convert to hotplug state machine

This driver has an asymmetry of ONLINE code without any corresponding tear
down code. Otherwise, this is a straightforward conversion.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153337.147128995@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 drivers/hwtracing/coresight/coresight-etm3x.c | 90 +++++++++++++++------------
 include/linux/cpuhotplug.h                    |  1 +
 2 files changed, 50 insertions(+), 41 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index d83ab82..2de4cad 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -51,6 +51,8 @@ module_param_named(boot_enable, boot_enable, int, S_IRUGO);
 static int etm_count;
 static struct etm_drvdata *etmdrvdata[NR_CPUS];
 
+static enum cpuhp_state hp_online;
+
 /*
  * Memory mapped writes to clear os lock are not supported on some processors
  * and OS lock must be unlocked before any memory mapped access on such
@@ -481,8 +483,7 @@ static int etm_enable_sysfs(struct coresight_device *csdev)
 
 	/*
 	 * Configure the ETM only if the CPU is online.  If it isn't online
-	 * hw configuration will take place when 'CPU_STARTING' is received
-	 * in @etm_cpu_callback.
+	 * hw configuration will take place on the local CPU during bring up.
 	 */
 	if (cpu_online(drvdata->cpu)) {
 		ret = smp_call_function_single(drvdata->cpu,
@@ -641,47 +642,44 @@ static const struct coresight_ops etm_cs_ops = {
 	.source_ops	= &etm_source_ops,
 };
 
-static int etm_cpu_callback(struct notifier_block *nfb, unsigned long action,
-			    void *hcpu)
+static int etm_online_cpu(unsigned int cpu)
 {
-	unsigned int cpu = (unsigned long)hcpu;
-
 	if (!etmdrvdata[cpu])
-		goto out;
+		return 0;
 
-	switch (action & (~CPU_TASKS_FROZEN)) {
-	case CPU_STARTING:
-		spin_lock(&etmdrvdata[cpu]->spinlock);
-		if (!etmdrvdata[cpu]->os_unlock) {
-			etm_os_unlock(etmdrvdata[cpu]);
-			etmdrvdata[cpu]->os_unlock = true;
-		}
-
-		if (local_read(&etmdrvdata[cpu]->mode))
-			etm_enable_hw(etmdrvdata[cpu]);
-		spin_unlock(&etmdrvdata[cpu]->spinlock);
-		break;
+	if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable)
+		coresight_enable(etmdrvdata[cpu]->csdev);
+	return 0;
+}
 
-	case CPU_ONLINE:
-		if (etmdrvdata[cpu]->boot_enable &&
-		    !etmdrvdata[cpu]->sticky_enable)
-			coresight_enable(etmdrvdata[cpu]->csdev);
-		break;
+static int etm_starting_cpu(unsigned int cpu)
+{
+	if (!etmdrvdata[cpu])
+		return 0;
 
-	case CPU_DYING:
-		spin_lock(&etmdrvdata[cpu]->spinlock);
-		if (local_read(&etmdrvdata[cpu]->mode))
-			etm_disable_hw(etmdrvdata[cpu]);
-		spin_unlock(&etmdrvdata[cpu]->spinlock);
-		break;
+	spin_lock(&etmdrvdata[cpu]->spinlock);
+	if (!etmdrvdata[cpu]->os_unlock) {
+		etm_os_unlock(etmdrvdata[cpu]);
+		etmdrvdata[cpu]->os_unlock = true;
 	}
-out:
-	return NOTIFY_OK;
+
+	if (local_read(&etmdrvdata[cpu]->mode))
+		etm_enable_hw(etmdrvdata[cpu]);
+	spin_unlock(&etmdrvdata[cpu]->spinlock);
+	return 0;
 }
 
-static struct notifier_block etm_cpu_notifier = {
-	.notifier_call = etm_cpu_callback,
-};
+static int etm_dying_cpu(unsigned int cpu)
+{
+	if (!etmdrvdata[cpu])
+		return 0;
+
+	spin_lock(&etmdrvdata[cpu]->spinlock);
+	if (local_read(&etmdrvdata[cpu]->mode))
+		etm_disable_hw(etmdrvdata[cpu]);
+	spin_unlock(&etmdrvdata[cpu]->spinlock);
+	return 0;
+}
 
 static bool etm_arch_supported(u8 arch)
 {
@@ -806,9 +804,17 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 				     etm_init_arch_data,  drvdata, 1))
 		dev_err(dev, "ETM arch init failed\n");
 
-	if (!etm_count++)
-		register_hotcpu_notifier(&etm_cpu_notifier);
-
+	if (!etm_count++) {
+		cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING,
+					  "AP_ARM_CORESIGHT_STARTING",
+					  etm_starting_cpu, etm_dying_cpu);
+		ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
+						"AP_ARM_CORESIGHT_ONLINE",
+						etm_online_cpu, NULL);
+		if (ret < 0)
+			goto err_arch_supported;
+		hp_online = ret;
+	}
 	put_online_cpus();
 
 	if (etm_arch_supported(drvdata->arch) == false) {
@@ -839,7 +845,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 
 	pm_runtime_put(&adev->dev);
 	dev_info(dev, "%s initialized\n", (char *)id->data);
-
 	if (boot_enable) {
 		coresight_enable(drvdata->csdev);
 		drvdata->boot_enable = true;
@@ -848,8 +853,11 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	return 0;
 
 err_arch_supported:
-	if (--etm_count == 0)
-		unregister_hotcpu_notifier(&etm_cpu_notifier);
+	if (--etm_count == 0) {
+		cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING);
+		if (hp_online)
+			cpuhp_remove_state_nocalls(hp_online);
+	}
 	return ret;
 }
 
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index ad26e35..576ad23 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -49,6 +49,7 @@ enum cpuhp_state {
 	CPUHP_AP_KVM_ARM_VGIC_STARTING,
 	CPUHP_AP_KVM_ARM_TIMER_STARTING,
 	CPUHP_AP_ARM_XEN_STARTING,
+	CPUHP_AP_ARM_CORESIGHT_STARTING,
 	CPUHP_AP_LEDTRIG_STARTING,
 	CPUHP_AP_NOTIFY_STARTING,
 	CPUHP_AP_ONLINE,

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[patch V2 00/67] cpuhotplug: Convert all priority notifiers to the  state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
  [patch V2 26/67] perf/x86/amd/power: Convert the hotplug notifier to  state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 49/67] arm/xen: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
    Re: [patch V2 49/67] arm/xen: Convert to hotplug state machine Stefano Stabellini <sstabellini@kernel.org> - 2016-07-13 20:30 +0200
    [tip:smp/hotplug] arm/xen: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 51/67] hwtracing/coresight-etm3x: Convert to hotplug state  machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
    [tip:smp/hotplug] hwtracing/coresight-etm3x: Convert to hotplug  state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 59/67] smp: Convert core to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
    [tip:smp/hotplug] smp/cfd: Convert core to hotplug state machine tip-bot for Richard Weinberger <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 55/67] hrtimer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 27/67] perf/core: Remove perf CPU notifier code Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 40/67] clocksource/metag: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 28/67] workqueue: Convert to state machine callbacks Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 56/67] timers/core: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 54/67] x86/tboot: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 48/67] arm/twd: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 47/67] arm/l2c: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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        Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-14 10:20 +0200
          Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state  machine Peter Zijlstra <peterz@infradead.org> - 2016-07-14 11:50 +0200
            Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-14 13:30 +0200
              Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state  machine Thomas Gleixner <tglx@linutronix.de> - 2016-07-14 13:40 +0200
                Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-14 14:00 +0200
                Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state  machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-15 16:20 +0200
                Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-18 10:30 +0200
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  [patch V2 60/67] KVM/arm/arm64/vgic-new: Convert to hotplug state  machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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  [patch V2 01/67] cpuhotplug: Handle early registration gracefully Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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  [patch V2 32/67] x86/kvm/kvmclock: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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  [patch V2 07/67] irqchip/bcm2836: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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  [patch V2 08/67] ARM: mvebu: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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  [patch V2 24/67] xtensa/perf: Convert the hotplug notifier to state  machine callbacks Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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  [patch V2 11/67] perf/x86/intel/uncore: Convert to hotplug state  machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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  [patch V2 23/67] bus/arm-ccn: Convert to hotplug statemachine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    Re: [patch V2 23/67] bus/arm-ccn: Convert to hotplug statemachine Pawel Moll <pawel.moll@arm.com> - 2016-07-18 20:40 +0200
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  [patch V2 25/67] perf/x86/amd/power: Change hotplug notifier to a  symmetric structure Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] perf/x86/amd/power: Change hotplug notifier to a  symmetric structure tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
  [patch V2 20/67] s390/perf: Convert the hotplug notifier to state  machine callbacks (Sampling) Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] s390/perf: Convert the hotplug notifier to state  machine callbacks (Sampling) tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
  [patch V2 33/67] x86/apb_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] x86/apb_timer: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:20 +0200
  [patch V2 61/67] rcu: Convert rcutree to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] rcu: Convert rcutree to hotplug state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:40 +0200
  [patch V2 31/67] KVM/x86: Remove superfluous SMP function call Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    Re: [patch V2 31/67] KVM/x86: Remove superfluous SMP function call Paolo Bonzini <pbonzini@redhat.com> - 2016-07-14 10:30 +0200
    [tip:smp/hotplug] KVM/x86: Remove superfluous SMP function call tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
  [patch V2 09/67] perf/core: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] perf/core: Convert to hotplug state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:10 +0200
  [patch V2 16/67] perf/x86/intel/cstate: Convert Intel CSTATE to  hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] perf/x86/intel/cstate: Convert Intel CSTATE to  hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
  [patch V2 22/67] bus/arm-cci: Convert to hotplug statemachine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    Re: [patch V2 22/67] bus/arm-cci: Convert to hotplug statemachine Punit Agrawal <punit.agrawal@arm.com> - 2016-07-15 14:40 +0200
    [tip:smp/hotplug] bus/arm-cci: Convert to hotplug statemachine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
  [patch V2 34/67] arm: Convert VFP hotplug notifiers to state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] arm: Convert VFP hotplug notifiers to state  machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
  [patch V2 36/67] virt: Convert kvm hotplug to state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] virt: Convert kvm hotplug to state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
  [patch V2 37/67] ACPI/processor: Avoid STARTING/DYING actions in a  more logical way Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] ACPI/processor: Avoid STARTING/DYING actions in a  more logical way tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:20 +0200
  [patch V2 41/67] clocksource/qcom-timer: Convert to hotplug state  machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] clocksource/qcom-timer: Convert to hotplug state  machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 52/67] hwtracing/coresight-etm4x: Convert to hotplug state  machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] hwtracing/coresight-etm4x: Convert to hotplug  state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 38/67] clocksource/arm_arch_timer: Convert to hotplug state  machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] clocksource/arm_arch_timer: Convert to hotplug  state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:20 +0200
  [patch V2 45/67] arm/kvm/arch_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] arm/kvm/arch_timer: Convert to hotplug state  machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-14 23:50 +0200
      Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-15 02:10 +0200
        Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-15 02:30 +0200
          Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Ingo Molnar <mingo@kernel.org> - 2016-07-15 10:50 +0200
            Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-15 14:20 +0200
          Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-15 18:30 +0200
            [PATCH v2] powerpc/numa: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-18 16:10 +0200
              [tip:smp/hotplug] powerpc/numa: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-22 22:00 +0200
  [patch V2 46/67] metag/perf: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] metag/perf: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 57/67] profile: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] profile: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:30 +0200
  [patch V2 12/67] perf/x86/amd/uncore: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
    [tip:smp/hotplug] perf/x86/amd/uncore: Convert to hotplug state  machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:10 +0200
  Re: [patch V2 00/67] cpuhotplug: Convert all priority notifiers to  the state machine Jason Cooper <jason@lakedaemon.net> - 2016-07-13 21:40 +0200

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