Иллюстрация: Henry Romero / Reuters
There are two options for POSSEing to Facebook currently:
，更多细节参见有道翻译
| .black_node left_tree = .black_node (.node (.red_node left_tree root_key sub_left) sub_mid (.red_node sub_right right_mid right_right))
However, CR0.WP is enabled at boot, and generally remains set for the life of a system. In this case, a page fault will be triggered in response to the write. As more of a tool to facilitate Copy-on-Write than a security boundary, this does not present any real restriction upon the kernel. That said, it does require the inconvenience of fault handling, which would not otherwise be necessary.