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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>,
        Matthew WilCox <willy@infradead.org>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Roman Gushchin <roman.gushchin@linux.dev>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
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?