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    SubjectRe: x86 ptep_get_and_clear question
    Manfred Spraul wrote:
    > A very simple test might be
    >
    > cpu 1:
    > cpu 2:

    Ben's test uses only one CPU.

    > Now start with variants:
    > change to read only instead of not present
    > a and b in the same way of the tlb, in a different way.
    > change pte with write, change with lock;
    > .
    > .
    > .
    >
    > But you'll never prove that you tested every combination.

    Indeed.

    -- Jamie
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