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    SubjectRe: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses
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    On 06/21/2018 03:08 PM, Peter Zijlstra wrote:
    > On Thu, Jun 21, 2018 at 03:00:03PM -0700, Fenghua Yu wrote:
    >> The control knob for kernel is to choose re-executing the faulting
    >> instruction (default) or kernel panic. Kernel panic may be useful in hard
    >> real time which has less tolerant to bad performance.
    > The kernel should never trigger this, ever. Any #AC is a plain bug and
    > should be fixed. So unconditional WARN+disable is suffient.

    It sounds like we need to start with that functionality and then if
    Fenghua wants to do more, we have add-on patches that can be evaluated
    by themselves.

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