[radeon-alex:amd-mainline-dkms-4.15 1429/1759] cc1: fatal error: drivers/gpu/drm/amd/amdkfd/backport/backport.h: No such file or directory

[kbuild test robot]

tree:   git://people.freedesktop.org/~agd5f/linux.git amd-mainline-dkms-4.15
head:   9556f93f18f7923978fb90f860c107fed9ca7f57
commit: 54df8c4830456ee6d9f9cb16c281e8bef8780dce [1429/1759] drm/amd/dkms: add amdkfd module
config: x86_64-federa-25 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 54df8c4830456ee6d9f9cb16c281e8bef8780dce
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> cc1: fatal error: drivers/gpu/drm/amd/amdkfd/backport/backport.h: No such file or directory
   compilation terminated.

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