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    SubjectRe: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC_CTRL feature
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    On 01/06/2018 06:41 AM, Konrad Rzeszutek Wilk wrote:
    >> .macro DISABLE_IBRS
    >> - ALTERNATIVE "jmp .Lskip_\@", "", X86_FEATURE_SPEC_CTRL
    >> + testl $1, dynamic_ibrs
    > On every system call we end up hammering on this 'dynamic_ibrs'
    > variable. And it looks like it can be flipped via the IPI mechanism.
    >
    > Would it make sense for this to be per-cpu?

    It's probably better to either just make it __read_mostly or get the
    static branches that folks were suggesting actually working.

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