[benjamin.gaignard:generic-zpos-v7 2/5] ERROR: "drm_atomic_helper_normalize_zpos" [drivers/gpu/drm/drm_kms_helper.ko] undefined!

[kbuild test robot]

tree:   https://git.linaro.org/people/benjamin.gaignard/kernel generic-zpos-v7
head:   8298ff6fe0b5241f7d4012901ae5bdbcb253051d
commit: 8f2efe1cee8fa2dca73eeb440aa993c434b43fe6 [2/5] drm: add generic zpos property
config: x86_64-randconfig-i0-201630 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.3-14) 4.9.3
reproduce:
        git checkout 8f2efe1cee8fa2dca73eeb440aa993c434b43fe6
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> ERROR: "drm_atomic_helper_normalize_zpos" [drivers/gpu/drm/drm_kms_helper.ko] undefined!

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0-DAY kernel test infrastructure                Open Source Technology Center
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