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    SubjectRe: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f
    Adding more people for this funky warning from the kbuild robot.

    Something is confused. UD0 is 0f ff, the bytes after that shouldn't
    matter. But I guess they can be interpreted as modrm bytes, and
    somebody started doing that.

    That said, intel only _documents_ UD2 (0f 0b).

    Maybe we should avoid using UD0/UD1 entirely.

    Linus

    On Wed, Feb 7, 2018 at 3:44 AM, kbuild test robot
    <fengguang.wu@intel.com> wrote:
    > tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
    > branch HEAD: a2e5790d841658485d642196dbb0927303d6c22f Merge branch 'akpm' (patches from Andrew)
    >
    > Regressions in current branch:
    >
    > arch/x86/tools/insn_decoder_test: warning: ffffffff810010d7: 0f ff eb ud0 %ebx,%ebp
    > arch/x86/tools/insn_decoder_test: warning: ffffffff81001152: 0f ff bf 09 00 00 00 ud0 0x9(%rdi),%edi
    > arch/x86/tools/insn_decoder_test: warning: ffffffff81001275: 0f ff eb ud0 %ebx,%ebp
    > arch/x86/tools/insn_decoder_test: warning: ffffffff810013fd: 0f ff bf 09 00 00 00 ud0 0x9(%rdi),%edi
    > arch/x86/tools/insn_decoder_test: warning: ffffffff81001499: 0f ff bf 09 00 00 00 ud0 0x9(%rdi),%edi
    > arch/x86/tools/insn_decoder_test: warning: ffffffff812296eb: 0f ff e8 ud0 %eax,%ebp

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