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[tip:smp/hotplug] x86/mce/therm_throt: Convert to hotplug state machine

From tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com>
Newsgroups linux.kernel
Subject [tip:smp/hotplug] x86/mce/therm_throt: Convert to hotplug state machine
Date 2016-11-21 16:50 +0100
Message-ID <sFZ10-2ZM-41@gated-at.bofh.it> (permalink)
References <sEzUZ-4p4-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Commit-ID:  4705ddca1df1d462bdeeb2fbb38b5259ccf80edf
Gitweb:     http://git.kernel.org/tip/4705ddca1df1d462bdeeb2fbb38b5259ccf80edf
Author:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>
AuthorDate: Thu, 17 Nov 2016 19:35:22 +0100
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 21 Nov 2016 16:37:04 +0100

x86/mce/therm_throt: 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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: rt@linuxtronix.de
Cc: Borislav Petkov <bp@alien8.de>
Cc: linux-edac@vger.kernel.org
Link: http://lkml.kernel.org/r/20161117183541.8588-2-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 arch/x86/kernel/cpu/mcheck/therm_throt.c | 55 ++++++++------------------------
 include/linux/cpuhotplug.h               |  1 +
 2 files changed, 14 insertions(+), 42 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index 6b9dc4d..7f56620 100644
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -271,58 +271,29 @@ static void thermal_throttle_remove_dev(struct device *dev)
 }
 
 /* Get notified when a cpu comes on/off. Be hotplug friendly. */
-static int
-thermal_throttle_cpu_callback(struct notifier_block *nfb,
-			      unsigned long action,
-			      void *hcpu)
+static int thermal_throttle_prepare(unsigned int cpu)
 {
-	unsigned int cpu = (unsigned long)hcpu;
-	struct device *dev;
-	int err = 0;
-
-	dev = get_cpu_device(cpu);
-
-	switch (action) {
-	case CPU_UP_PREPARE:
-	case CPU_UP_PREPARE_FROZEN:
-		err = thermal_throttle_add_dev(dev, cpu);
-		WARN_ON(err);
-		break;
-	case CPU_UP_CANCELED:
-	case CPU_UP_CANCELED_FROZEN:
-	case CPU_DEAD:
-	case CPU_DEAD_FROZEN:
-		thermal_throttle_remove_dev(dev);
-		break;
-	}
-	return notifier_from_errno(err);
+	struct device *dev = get_cpu_device(cpu);
+
+	return thermal_throttle_add_dev(dev, cpu);
 }
 
-static struct notifier_block thermal_throttle_cpu_notifier =
+static int thermal_throttle_dead(unsigned int cpu)
 {
-	.notifier_call = thermal_throttle_cpu_callback,
-};
+	struct device *dev = get_cpu_device(cpu);
+
+	thermal_throttle_remove_dev(dev);
+	return 0;
+}
 
 static __init int thermal_throttle_init_device(void)
 {
-	unsigned int cpu = 0;
-	int err;
-
 	if (!atomic_read(&therm_throt_en))
 		return 0;
 
-	cpu_notifier_register_begin();
-
-	/* connect live CPUs to sysfs */
-	for_each_online_cpu(cpu) {
-		err = thermal_throttle_add_dev(get_cpu_device(cpu), cpu);
-		WARN_ON(err);
-	}
-
-	__register_hotcpu_notifier(&thermal_throttle_cpu_notifier);
-	cpu_notifier_register_done();
-
-	return 0;
+	return cpuhp_setup_state(CPUHP_X86_THERM_PREPARE, "x86/therm:prepare",
+				 thermal_throttle_prepare,
+				 thermal_throttle_dead);
 }
 device_initcall(thermal_throttle_init_device);
 
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 79b96f6..aea6c6a 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -59,6 +59,7 @@ enum cpuhp_state {
 	CPUHP_BLK_MQ_PREPARE,
 	CPUHP_NET_FLOW_PREPARE,
 	CPUHP_TOPOLOGY_PREPARE,
+	CPUHP_X86_THERM_PREPARE,
 	CPUHP_TIMERS_DEAD,
 	CPUHP_NOTF_ERR_INJ_PREPARE,
 	CPUHP_MIPS_SOC_PREPARE,

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Thread

cpu hotplug: convert more drivers (batch #5) Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:40 +0100
  [PATCH 12/20] net/iucv: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:40 +0100
    [tip:smp/hotplug] net/iucv: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 17:00 +0100
    [tip:smp/hotplug] net/iucv: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-23 00:20 +0100
    Re: [PATCH 12/20] net/iucv: Convert to hotplug state machine Ursula Braun <ubraun@linux.vnet.ibm.com> - 2016-11-23 20:40 +0100
      Re: [PATCH 12/20] net/iucv: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-24 10:20 +0100
        [PATCH 12/20 v2] net/iucv: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-24 15:20 +0100
          [PATCH] net/iucv: use explicit clean up labels in iucv_init() Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-24 17:20 +0100
            [tip:smp/hotplug] net/iucv: Use explicit clean up labels in  iucv_init() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-24 21:00 +0100
  [PATCH 09/20] powercap/intel rapl: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:40 +0100
    [tip:smp/hotplug] powercap/intel rapl: Convert to hotplug state  machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 17:00 +0100
  [PATCH 19/20] x86/oprofile/nmi: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:40 +0100
    [tip:smp/hotplug] x86/oprofile/nmi: Convert to hotplug state  machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 17:00 +0100
    [tip:smp/hotplug] x86/oprofile/nmi: Convert to hotplug state  machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-22 23:50 +0100
  [PATCH 14/20] arm/bL_switcher: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:40 +0100
    [tip:smp/hotplug] arm/bL_switcher: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 17:00 +0100
    [tip:smp/hotplug] arm/bL_switcher: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-22 23:50 +0100
  [PATCH 13/20] sched/nohz: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:40 +0100
    [tip:smp/hotplug] sched/nohz: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 17:00 +0100
    [tip:smp/hotplug] sched/nohz: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-23 00:20 +0100
  [PATCH 16/20] powerpc/sysfs: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:40 +0100
    [tip:smp/hotplug] powerpc/sysfs: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 17:00 +0100
    [tip:smp/hotplug] powerpc/sysfs: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-22 23:50 +0100
  [PATCH 10/20] powercap/intel_rapl: Cleanup duplicated init code Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:50 +0100
    [tip:smp/hotplug] powercap/intel_rapl: Cleanup duplicated init code tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-11-21 17:00 +0100
  [PATCH 01/20] x86/mce/therm_throt: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:50 +0100
    [tip:smp/hotplug] x86/mce/therm_throt: Convert to hotplug state  machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 16:50 +0100
    [tip:smp/hotplug] x86/mce/therm_throt: Convert to hotplug state  machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-22 23:50 +0100
  [PATCH 07/20] pci/xgene-msi: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:50 +0100
    [tip:smp/hotplug] PCI/xgene-msi: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 16:50 +0100
    [tip:smp/hotplug] PCI/xgene-msi: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-23 00:20 +0100
  [PATCH 06/20] hwmon/via-cputemp: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:50 +0100
    [PATCH 06/20 v2] hwmon/via-cputemp: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-18 16:20 +0100
    Re: [PATCH 06/20] hwmon/via-cputemp: Convert to hotplug state machine Guenter Roeck <linux@roeck-us.net> - 2016-11-23 16:40 +0100
  [PATCH 05/20] hwmon/via-cputemp: Remove pointless CPU check on each CPU Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:50 +0100
    Re: [05/20] hwmon/via-cputemp: Remove pointless CPU check on each CPU Guenter Roeck <linux@roeck-us.net> - 2016-11-19 18:30 +0100
      Re: [05/20] hwmon/via-cputemp: Remove pointless CPU check on each CPU Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-20 00:00 +0100
        Re: [05/20] hwmon/via-cputemp: Remove pointless CPU check on each CPU Guenter Roeck <linux@roeck-us.net> - 2016-11-20 05:00 +0100
          Re: [05/20] hwmon/via-cputemp: Remove pointless CPU check on each CPU Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-20 21:40 +0100
  [PATCH 08/20] powercap/intel_rapl: Add missing domain data update on hotplug Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:50 +0100
    [tip:smp/hotplug] powercap/intel_rapl: Add missing domain data  update on hotplug tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-11-21 16:50 +0100
  [PATCH 03/20] x86/msr: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-17 19:50 +0100
    [tip:smp/hotplug] x86/msr: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-21 16:50 +0100
    [tip:smp/hotplug] x86/msr: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-11-22 23:50 +0100

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