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    SubjectRe: [3/3 PATCH] Kprobes: User space probes support- single stepping out-of-line
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    > And we'll need to actually *be* in-atomic.  That means we need an
    > open-coded inc_preempt_count() and dec_preempt_count() in there and I don't
    > see them.
    >

    ..

    > Why is VM_LOCKED being set? (It needs a comment).
    >
    > Where does it get unset?


    if this is an attempt to make the copy_in_atomic to be atomic, then it
    is a bug; the user can unset this bit after all via mprotect, even from
    another thread, and concurrently. UnGood(tm).


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