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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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