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

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