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ia64/err-inject: Convert to hotplug state machine 

Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

The removal of the files happens now in the prepare down stage as there is
no reason to keep them around until the cpu has actually died.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-ia64@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161103145021.28528-15-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-03 15:50:10 +01:00 committed by Thomas Gleixner
parent 38643a0e69
commit 122231445f
1 changed files with 19 additions and 59 deletions
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80
arch/ia64/kernel/err_inject.c
View File

@ -224,85 +224,45 @@ static struct attribute_group err_inject_attr_group = {
.name = "err_inject"
};
/* Add/Remove err_inject interface for CPU device */
static int err_inject_add_dev(struct device *sys_dev)
static int err_inject_add_dev(unsigned int cpu)
{
struct device *sys_dev = get_cpu_device(cpu);
return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
}
static int err_inject_remove_dev(struct device *sys_dev)
static int err_inject_remove_dev(unsigned int cpu)
{
struct device *sys_dev = get_cpu_device(cpu);
sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
return 0;
}
static int err_inject_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
static enum cpuhp_state hp_online;
static int __init err_inject_init(void)
{
unsigned int cpu = (unsigned long)hcpu;
struct device *sys_dev;
sys_dev = get_cpu_device(cpu);
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
err_inject_add_dev(sys_dev);
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
err_inject_remove_dev(sys_dev);
break;
}
return NOTIFY_OK;
}
static struct notifier_block err_inject_cpu_notifier =
{
.notifier_call = err_inject_cpu_callback,
};
static int __init
err_inject_init(void)
{
int i;
int ret;
#ifdef ERR_INJ_DEBUG
printk(KERN_INFO "Enter error injection driver.\n");
#endif
cpu_notifier_register_begin();
for_each_online_cpu(i) {
err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE,
(void *)(long)i);
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/err_inj:online",
err_inject_add_dev, err_inject_remove_dev);
if (ret >= 0) {
hp_online = ret;
ret = 0;
}
return ret;
}
__register_hotcpu_notifier(&err_inject_cpu_notifier);
cpu_notifier_register_done();
return 0;
}
static void __exit
err_inject_exit(void)
static void __exit err_inject_exit(void)
{
int i;
struct device *sys_dev;
#ifdef ERR_INJ_DEBUG
printk(KERN_INFO "Exit error injection driver.\n");
#endif
cpu_notifier_register_begin();
for_each_online_cpu(i) {
sys_dev = get_cpu_device(i);
sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
}
__unregister_hotcpu_notifier(&err_inject_cpu_notifier);
cpu_notifier_register_done();
cpuhp_remove_state(hp_online);
}
module_init(err_inject_init);