linux-kernel - Re: [PATCH 3/5] mm/slab: Do not call kmalloc

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Message-ID: <8915b858-b46d-0acd-bebd-80a0c9882a7e@suse.cz>
Date:   Thu, 24 Feb 2022 13:48:47 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org
Cc:     Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH 3/5] mm/slab: Do not call kmalloc_large() for unsupported
 size

On 2/21/22 11:53, Hyeonggon Yoo wrote:
> SLAB's kfree() does not support freeing an object that is allocated from
> kmalloc_large(). Fix this as SLAB do not pass requests larger than
> KMALLOC_MAX_CACHE_SIZE directly to page allocator.

AFAICS this issue is limited to build-time constant sizes. Might be better
to make this a build error rather than build-time NULL?

> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>