static void aio_ring_remap(struct file *file, struct vm_area_struct *vma)
{
	struct mm_struct *mm = vma->vm_mm;
	struct kioctx_table *table;
	int i;

	spin_lock(&mm->ioctx_lock);
	rcu_read_lock();
	table = rcu_dereference(mm->ioctx_table);
	for (i = 0; i < table->nr; i++) {
		struct kioctx *ctx;

		ctx = table->table[i];
		if (ctx && ctx->aio_ring_file == file) {
			ctx->user_id = ctx->mmap_base = vma->vm_start;
			break;
		}
	}

	rcu_read_unlock();
	spin_unlock(&mm->ioctx_lock);
}

Unknown