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fs/userfaultfd.o: warning: objtool: userfaultfd_read()+0x5a: unreachable instruction

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   820bf5c419e4b85298e5c3001bd1b5be46d60765
commit: 39358a033b2e4432052265c1fa0f36f572d8cfb5 objtool, x86: Add facility for asm code to provide unwind hints
date:   9 weeks ago
config: x86_64-randconfig-a0-09201830 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout 39358a033b2e4432052265c1fa0f36f572d8cfb5
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

>> fs/userfaultfd.o: warning: objtool: userfaultfd_read()+0x5a: unreachable instruction

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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fs/userfaultfd.o: warning: objtool: userfaultfd_read()+0x5a:  unreachable instruction kbuild test robot <fengguang.wu@intel.com> - 2017-09-20 14:10 +0200

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