These types can be used only inside the kernel, in code that is never revealed to user-space (say, inside a user-visible structure in a header file).

上述的这些类型只能在内核中使用，不可以在用户空间中出现。

youdao

These types can be used only inside the kernel, in code that is never revealed to user-space (say, inside a user-visible structure in a header file).

上述的这些类型只能在内核中使用，不可以在用户空间中出现。

youdao