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    SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
    H. Peter Anvin wrote:
    > Thinking about this some more, I don't know if it would make sense to
    > put the x86-64 stack canary at the *end* of the percpu area, and
    > otherwise use negative offsets. That would make sure they were
    > readily reachable from %rip-based references from within the kernel
    > text area.

    If we can move the canary then a whole pile of options open up. But the
    problem is that we can't.


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