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Date: Thu, 14 Apr 2022 11:58:01 +0200 (CEST)
From: Christoph Lameter <cl@gentwo.de>
To: Hyeonggon Yoo <42.hyeyoo@gmail.com>
cc: Vlastimil Babka <vbabka@suse.cz>, Marco Elver <elver@google.com>, 
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Subject: Re: [PATCH v2 23/23] mm/sl[au]b: check if large object is valid in
 __ksize()
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On Thu, 14 Apr 2022, Hyeonggon Yoo wrote:

> If address of large object is not beginning of folio or size of
> the folio is too small, it must be invalid. Return zero in such cases.

This looks like a slab usage error on the part of the caller that would
benefit from a kernel log entry. A warning or an error?