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    SubjectRe: [RFC PATCH 1/2] x86/ibpb: Skip IBPB when we switch back to same user process
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    > 
    > This patch tries to address the case when we do switch to init_mm and back.
    > Do you still have objections to the approach in this patch
    > to save the last active mm before switching to init_mm?

    how do you know the last active mm did not go away and started a new process with new content?
    (other than taking a reference which has other side effects)

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