[drm-intel:drm-intel-next-queued 2/12] drivers/gpu/drm/i915/i915_gem_gtt.o: warning: objtool: i915_get_ggtt_vma_pages()+0x425: function has unreachable instruction

[kbuild test robot]

tree:   git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
head:   8d970654b767ebe8aeb524d30e27b37c0cb8eaed
commit: 6687c9062c46c83e5a07df65015eb4fc9dc76524 [2/12] drm/i915: Rewrite fb rotation GTT handling
config: x86_64-randconfig-s3-08172039 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout 6687c9062c46c83e5a07df65015eb4fc9dc76524
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/i915/i915_gem_gtt.o: warning: objtool: i915_get_ggtt_vma_pages()+0x425: function has unreachable instruction

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