cpu-notifier-error-inject.c

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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpu.h>

#include "notifier-error-inject.h"

static int priority;
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "specify cpu notifier priority");

static struct notifier_err_inject cpu_notifier_err_inject = {
    .actions = {
        { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE) },
        { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE_FROZEN) },
        { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE) },
        { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE_FROZEN) },
        {}
    }
};

static struct dentry *dir;

static int err_inject_init(void)
{
    int err;

    dir = notifier_err_inject_init("cpu", notifier_err_inject_dir,
                    &cpu_notifier_err_inject, priority);
    if (IS_ERR(dir))
        return PTR_ERR(dir);

    err = register_hotcpu_notifier(&cpu_notifier_err_inject.nb);
    if (err)
        debugfs_remove_recursive(dir);

    return err;
}

static void err_inject_exit(void)
{
    unregister_hotcpu_notifier(&cpu_notifier_err_inject.nb);
    debugfs_remove_recursive(dir);
}

module_init(err_inject_init);
module_exit(err_inject_exit);

MODULE_DESCRIPTION("CPU notifier error injection module");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Akinobu Mita <[email protected]>");