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Date:   Mon, 4 Apr 2022 11:28:02 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Zi Yan <ziy@...dia.com>
Cc:     Zi Yan <zi.yan@...t.com>, linux-mm@...ck.org,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        linux-kernel@...r.kernel.org,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>
Subject: Re: [PATCH] mm: migrate: use thp_order instead of HPAGE_PMD_ORDER
 for new page allocation.

On Mon,  4 Apr 2022 12:53:25 -0400 Zi Yan <zi.yan@...t.com> wrote:

> From: Zi Yan <ziy@...dia.com>
> 
> With folios support, it is possible to have other than HPAGE_PMD_ORDER
> THPs, in the form of folios, in the system. Use thp_order() to correctly
> determine the source page order during migration.

Changelog doesn't describe the end user visible effects of the bug. 
And it really should, because

> Link: https://lore.kernel.org/linux-mm/20220404132908.GA785673@u2004/

it fixes a kernel crash!


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