This function validates and invalidates PTE entries, it will be used
in the later patch.
Acked-by: NMarco Elver <elver@google.com>
Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NRussell King (Oracle) <rmk+kernel@armlinux.org.uk>