mm/slub: Add debugging to verify correct cache use on kmem_cache_free()

mm/slub: Add debugging to verify correct cache use on kmem_cache_free()

Add additional debugging to check that the objects is actually from the cache
the caller claims. Doing so currently trips up some other debugging code. It
takes a lot to infer from that what was happening.

Reviewed-by: Glauber Costa <[email protected]>
Signed-off-by: Christoph Lameter <[email protected]>
[ [email protected]: Use pr_err() ]
Signed-off-by: Pekka Enberg <[email protected]>