linux-kernel - Re: [PATCH RFC 07/35] mm/memremap: reject unreasonable folio/compound page sizes in memremap

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Message-Id: <20250822170951.53418-1-sj@kernel.org>
Date: Fri, 22 Aug 2025 10:09:51 -0700
From: SeongJae Park <sj@...nel.org>
To: David Hildenbrand <david@...hat.com>
Cc: SeongJae Park <sj@...nel.org>,
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Subject: Re: [PATCH RFC 07/35] mm/memremap: reject unreasonable folio/compound page sizes in memremap_pages()

On Thu, 21 Aug 2025 22:06:33 +0200 David Hildenbrand <david@...hat.com> wrote:

> Let's reject unreasonable folio sizes early, where we can still fail.
> We'll add sanity checks to prepare_compound_head/prepare_compound_page
> next.
> 
> Is there a way to configure a system such that unreasonable folio sizes
> would be possible? It would already be rather questionable.
> 
> If so, we'd probably want to bail out earlier, where we can avoid a
> WARN and just report a proper error message that indicates where
> something went wrong such that we messed up.
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>

Acked-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

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