static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
{
	atomic_set(&mm->mm_users, 1);
	atomic_set(&mm->mm_count, 1);
	init_rwsem(&mm->mmap_sem);
	INIT_LIST_HEAD(&mm->mmlist);
	mm->flags = (current->mm) ?
		(current->mm->flags & MMF_INIT_MASK) : default_dump_filter;
	mm->core_state = NULL;
	mm->nr_ptes = 0;
	memset(&mm->rss_stat, 0, sizeof(mm->rss_stat));
	spin_lock_init(&mm->page_table_lock);
	mm->free_area_cache = TASK_UNMAPPED_BASE;
	mm->cached_hole_size = ~0UL;
	mm_init_aio(mm);
	mm_init_owner(mm, p);

	if (likely(!mm_alloc_pgd(mm))) {
		mm->def_flags = 0;
		mmu_notifier_mm_init(mm);
		return mm;
	}

	free_mm(mm);
	return NULL;
}
static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
{
	atomic_set(&mm->mm_users, 1);
	atomic_set(&mm->mm_count, 1);
	init_rwsem(&mm->mmap_sem);
	INIT_LIST_HEAD(&mm->mmlist);
	mm->flags = (current->mm) ?
		(current->mm->flags & MMF_INIT_MASK) : default_dump_filter;
	mm->core_state = NULL;
	mm->nr_ptes = 0;
	memset(&mm->rss_stat, 0, sizeof(mm->rss_stat));
	spin_lock_init(&mm->page_table_lock);
	mm->free_area_cache = TASK_UNMAPPED_BASE;
	mm->cached_hole_size = ~0UL;
	mm_init_aio(mm);
	mm_init_owner(mm, p);

	if (likely(!mm_alloc_pgd(mm))) {
		mm->def_flags = 0;
		mmu_notifier_mm_init(mm);
		return mm;
	}

	free_mm(mm);
	return NULL;
}