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x86/mce/therm_throt: Convert to hotplug state machine

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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>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-17 19:35:22 +01:00 committed by Thomas Gleixner
parent 254fe9c7a4
commit d6526e73db
2 changed files with 13 additions and 41 deletions
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53
arch/x86/kernel/cpu/mcheck/therm_throt.c
View File

@ -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;
struct device *dev = get_cpu_device(cpu);
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);
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);

1
include/linux/cpuhotplug.h
View File

@ -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,