linux-kernel - Re: [PATCH v2] mm/huge_memory: fix dereferencing invalid pmd migration entry

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Message-ID: <321CF34D-79CF-4B14-AE3D-5815B8D74E8A@nvidia.com>
Date: Fri, 18 Apr 2025 07:50:35 -0400
From: Zi Yan <ziy@...dia.com>
To: Gavin Guo <gavinguo@...lia.com>
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, david@...hat.com,
 willy@...radead.org, linmiaohe@...wei.com, hughd@...gle.com,
 revest@...gle.com, kernel-dev@...lia.com, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH v2] mm/huge_memory: fix dereferencing invalid pmd
 migration entry

On 18 Apr 2025, at 4:58, Gavin Guo wrote:

> When migrating a THP, concurrent access to the PMD migration entry
> during a deferred split scan can lead to a invalid address access, as

s/a/an/

> illustrated below. To prevent this page fault, it is necessary to check

s/this page fault/this invalid access/

The rest looks good to me.


Best Regards,
Yan, Zi