Commit-ID: d6526e73dbbbc4c382c1b16942413eab77ed5e1a Gitweb: http://git.kernel.org/tip/d6526e73dbbbc4c382c1b16942413eab77ed5e1a Author: Sebastian Andrzej Siewior <bige...@linutronix.de> AuthorDate: Thu, 17 Nov 2016 19:35:22 +0100 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Tue, 22 Nov 2016 23:34:38 +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 <bige...@linutronix.de> Cc: Tony Luck <tony.l...@intel.com> Cc: r...@linuxtronix.de Cc: Borislav Petkov <b...@alien8.de> Cc: linux-e...@vger.kernel.org Link: http://lkml.kernel.org/r/20161117183541.8588-2-bige...@linutronix.de Signed-off-by: Thomas Gleixner <t...@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,
