ascend inclusion
category: feature
bugzilla: NA
CVE: NA

https://lwn.net/ml/linux-kernel/20200825145753.529284-10-npiggin@gmail.com/
--------------

This is a generic kernel virtual memory mapper, not specific to ioremap.
Signed-off-by: NNicholas Piggin <npiggin@gmail.com>
Signed-off-by: NRui Xiang <rui.xiang@huawei.com>
Reviewed-by: NDing Tianhong <dingtianhong@huawei.com>
Reviewed-by: NZefan Li <lizefan@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>