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    SubjectRe: [PATCH 1/3] percpu: use ZERO_SIZE_PTR / ZERO_OR_NULL_PTR
    On Mon, 30 Jan 2012, Tejun Heo wrote:

    > Percpu pointers are in a different address space and using
    > ZERO_SIZE_PTR directly will trigger sparse address space warning.
    > Also, I'm not entirely sure whether 16 is guaranteed to be unused in
    > percpu address space (maybe it is but I don't think we have anything
    > enforcing that).

    We are already checking for NULL on free. So there is a presumption that
    these numbers are unused.



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