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    SubjectRe: [GIT PULL] x86/build changes for v4.17
    On Wed, Apr 04, 2018 at 04:53:52PM +0000, Nick Desaulniers wrote:
    > (re-sending as plain text)
    >
    > On Wed, Apr 4, 2018 at 2:38 AM Greg KH <gregkh@linuxfoundation.org> wrote:
    > > There are known-bugs with building a kernel with clang right now (I
    > > pointed one out a few days ago about NULL checks being deleted from the
    > > clang output for no good reason, which really is scary for obvious
    > > reasons).
    >
    > Is this the thread you are referring to?
    > https://lkml.org/lkml/2018/3/27/1286
    >
    > It's definitely something curious that I'll need to sit down and
    > investigate more. If there are other known instances, it would be good to
    > let me know.

    As Matthias mentioned elsewhere, it sounds like they're planning to
    implement -fno-delete-null-pointer-checks, which would presumably fix
    the above issue.

    Aside from the above-mentioned debugfs NULL checks, there was also
    another (seemingly valid) objtool warning:

    arch/x86/mm/pti.o: warning: objtool: pti_init() falls through to next function pti_user_pagetable_walk_pmd()

    I don't know if that one was also caused by removed NULL checks, but
    it's worth investigating.

    More details (and the .o file) here:

    https://lkml.kernel.org/r/20180319232255.GF37438@google.com

    --
    Josh

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