arch/x86/events/intel/uncore_snbep.o: warning: objtool: snbep_uncore_msr_enable_event()+0x2e: function has unreachable instruction

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   47ef4ad2684d380dd6d596140fb79395115c3950
commit: 3b94a891667c30fb4624221497d77fc65d950345 perf/x86/intel/uncore: Remove SBOX support for Broadwell server
date:   7 weeks ago
config: x86_64-randconfig-s0-07191857 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout 3b94a891667c30fb4624221497d77fc65d950345
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

>> arch/x86/events/intel/uncore_snbep.o: warning: objtool: snbep_uncore_msr_enable_event()+0x2e: function has unreachable instruction

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