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slub: Add check for kfree() of non slab objects.
We can detect kfree()s on non slab objects by checking for PageCompound(). Works in the same way as for ksize. This helped me catch an invalid kfree(). Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
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