Thank you for you quick response.

Sorry, I have once again looked at the origin kernel source before the header 
DEB is built.
Then I see the user space .h is correctly isolated in uapi  tree.
Some how, the process of compile and install, has striped all kernel macro 
directive from these user space .h
I haven't figured out what cause this
I follow this guide to build the custom kernel with its associate header 
https://help.ubuntu.com/community/Kernel/Compile
And exactly from apt-get source

MAKEFLAGS="HOSTCC=/usr/bin/gcc CCACHE_PREFIX=distcc" make-kpkg --rootcmd
fakeroot --initrd --append-to-version=-suspend2 kernel-image kernel-
headers kernel-source

So, I suppose this is not a bug but may be the default feature of the build 
tool chain.
Am I correct?
It is an off topic 
But I don't know why custom header is striped out that way, when ubuntu header 
retain origin directive.

Regards

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https://bugs.launchpad.net/bugs/1766663

Title:
  source kernel 4.15 bug in media.h

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