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drivers base/topology: Convert to hotplug state machine 

Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs. No functional change

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161103145021.28528-14-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Sebastian Andrzej Siewior 2016-11-03 15:50:09 +01:00 committed by Thomas Gleixner
parent 7cc277b489
commit 38643a0e69
2 changed files with 6 additions and 37 deletions
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42
drivers/base/topology.c
View File

@ -118,51 +118,19 @@ static int topology_add_dev(unsigned int cpu)
return sysfs_create_group(&dev->kobj, &topology_attr_group);
}
static void topology_remove_dev(unsigned int cpu)
static int topology_remove_dev(unsigned int cpu)
{
struct device *dev = get_cpu_device(cpu);
sysfs_remove_group(&dev->kobj, &topology_attr_group);
}
static int topology_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
int rc = 0;
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
rc = topology_add_dev(cpu);
break;
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
topology_remove_dev(cpu);
break;
}
return notifier_from_errno(rc);
return 0;
}
static int topology_sysfs_init(void)
{
int cpu;
int rc = 0;
cpu_notifier_register_begin();
for_each_online_cpu(cpu) {
rc = topology_add_dev(cpu);
if (rc)
goto out;
}
__hotcpu_notifier(topology_cpu_callback, 0);
out:
cpu_notifier_register_done();
return rc;
return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
"base/topology:prepare", topology_add_dev,
topology_remove_dev);
}
device_initcall(topology_sysfs_init);

1
include/linux/cpuhotplug.h
View File

@ -57,6 +57,7 @@ enum cpuhp_state {
CPUHP_SH_SH3X_PREPARE,
CPUHP_BLK_MQ_PREPARE,
CPUHP_NET_FLOW_PREPARE,
CPUHP_TOPOLOGY_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_NOTF_ERR_INJ_PREPARE,
CPUHP_MIPS_SOC_PREPARE,