64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/cpu.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/notifier.h>
|
||
|
|
|
||
|
|
static int priority;
|
||
|
|
static int cpu_up_prepare_error;
|
||
|
|
static int cpu_down_prepare_error;
|
||
|
|
|
||
|
|
module_param(priority, int, 0);
|
||
|
|
MODULE_PARM_DESC(priority, "specify cpu notifier priority");
|
||
|
|
|
||
|
|
module_param(cpu_up_prepare_error, int, 0644);
|
||
|
|
MODULE_PARM_DESC(cpu_up_prepare_error,
|
||
|
|
"specify error code to inject CPU_UP_PREPARE action");
|
||
|
|
|
||
|
|
module_param(cpu_down_prepare_error, int, 0644);
|
||
|
|
MODULE_PARM_DESC(cpu_down_prepare_error,
|
||
|
|
"specify error code to inject CPU_DOWN_PREPARE action");
|
||
|
|
|
||
|
|
static int err_inject_cpu_callback(struct notifier_block *nfb,
|
||
|
|
unsigned long action, void *hcpu)
|
||
|
|
{
|
||
|
|
int err = 0;
|
||
|
|
|
||
|
|
switch (action) {
|
||
|
|
case CPU_UP_PREPARE:
|
||
|
|
case CPU_UP_PREPARE_FROZEN:
|
||
|
|
err = cpu_up_prepare_error;
|
||
|
|
break;
|
||
|
|
case CPU_DOWN_PREPARE:
|
||
|
|
case CPU_DOWN_PREPARE_FROZEN:
|
||
|
|
err = cpu_down_prepare_error;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (err)
|
||
|
|
printk(KERN_INFO "Injecting error (%d) at cpu notifier\n", err);
|
||
|
|
|
||
|
|
return notifier_from_errno(err);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct notifier_block err_inject_cpu_notifier = {
|
||
|
|
.notifier_call = err_inject_cpu_callback,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int err_inject_init(void)
|
||
|
|
{
|
||
|
|
err_inject_cpu_notifier.priority = priority;
|
||
|
|
|
||
|
|
return register_hotcpu_notifier(&err_inject_cpu_notifier);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void err_inject_exit(void)
|
||
|
|
{
|
||
|
|
unregister_hotcpu_notifier(&err_inject_cpu_notifier);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(err_inject_init);
|
||
|
|
module_exit(err_inject_exit);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("CPU notifier error injection module");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
|