Header organization/separation rule in kernel

[Shiyao MA]

Hi,

I wonder the header separation rule in kernel.
To make this question concrete, for example, let's targeting genetlink.h

It can be found in:

http://elixir.free-electrons.com/linux/latest/source/include/net/genetlink.h
http://elixir.free-electrons.com/linux/latest/source/include/linux/genetlink.h
http://elixir.free-electrons.com/linux/latest/source/include/uapi/linux/genetlink.h


so basically three parts, in uapi, linux/genetlink.h, and net/genetlink.h.

I understand the necessity of uapi, but why divide the genetlink.h in
linux and the net folder?
What's the benefit of such separation?



-- 
Best,
Shiyao