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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:

    > I'm pretty sure it never gives out NULL for a dynamic allocation. The
    > base might be mapped to zero but we're guaranteed to have some static
    > percpu areas there and IIRC the percpu addresses aren't supposed to
    > wrap.

    True but there is a check for a NULL pointer on free. So a NULL pointer
    currently has the semantics of being an unallocated per cpu structure.
    If the allocator returns NULL by accident then we cannot free the per cpu
    allocation anymore.


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