Automatically generate /dev/logger

Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com>
Remap pfn range of the area in kernel

Remap the pfn range of the related vma, which is mapping from kernel
to userspace. Or other parts of Kernel (e.g. swap module) will get
wrong page when trying to swap.

Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com>