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    SubjectRe: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)
    Christoph Lameter wrote:
    > SLUB: Return ZERO_SIZE_PTR for kmalloc(0) V3
    > Instead of returning the smallest available object return ZERO_SIZE_PTR.
    > A ZERO_SIZE_PTR can be legitimately used as an object pointer as long
    > as it is not deferenced. The dereference of ZERO_SIZE_PTR causes a
    > distinctive fault.
    > kfree can handle a ZERO_SIZE_PTR in the same way as NULL.

    FWIW, I am happy :-). We should add a comment to kmalloc() that we
    return non-unique pointers for zero-length allocations though.

    Acked-by: Pekka Enberg <>
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