static int __init ksm_init(void)
{
	struct task_struct *ksm_thread;
	int err;

	err = ksm_slab_init();
	if (err)
		goto out;

	ksm_thread = kthread_run(ksm_scan_thread, NULL, "ksmd");
	if (IS_ERR(ksm_thread)) {
		printk(KERN_ERR "ksm: creating kthread failed\n");
		err = PTR_ERR(ksm_thread);
		goto out_free;
	}

#ifdef CONFIG_SYSFS
	err = sysfs_create_group(mm_kobj, &ksm_attr_group);
	if (err) {
		printk(KERN_ERR "ksm: register sysfs failed\n");
		kthread_stop(ksm_thread);
		goto out_free;
	}
#else
	ksm_run = KSM_RUN_MERGE;	/* no way for user to start it */

#endif /* CONFIG_SYSFS */

#ifdef CONFIG_MEMORY_HOTREMOVE
	/*
	 * Choose a high priority since the callback takes ksm_thread_mutex:
	 * later callbacks could only be taking locks which nest within that.
	 */
	hotplug_memory_notifier(ksm_memory_callback, 100);
#endif
	return 0;

out_free:
	ksm_slab_free();
out:
	return err;
}
static int __init ksm_init(void)
{
	struct task_struct *ksm_thread;
	int err;

	err = ksm_slab_init();
	if (err)
		goto out;

	ksm_thread = kthread_run(ksm_scan_thread, NULL, "ksmd");
	if (IS_ERR(ksm_thread)) {
		printk(KERN_ERR "ksm: creating kthread failed\n");
		err = PTR_ERR(ksm_thread);
		goto out_free;
	}

#ifdef CONFIG_SYSFS
	err = sysfs_create_group(mm_kobj, &ksm_attr_group);
	if (err) {
		printk(KERN_ERR "ksm: register sysfs failed\n");
		kthread_stop(ksm_thread);
		goto out_free;
	}
#else
	ksm_run = KSM_RUN_MERGE;	 

#endif  

#ifdef CONFIG_MEMORY_HOTREMOVE
	 
	hotplug_memory_notifier(ksm_memory_callback, 100);
#endif
	return 0;

out_free:
	ksm_slab_free();
out:
	return err;
}