Re: [PATCH] mm: migrate: use thp_order instead of HPAGE_PMD_ORDER for new page allocation.

From: Zi Yan
Date: Mon Apr 04 2022 - 17:41:41 EST

On 4 Apr 2022, at 14:28, Andrew Morton wrote:

> On Mon, 4 Apr 2022 12:53:25 -0400 Zi Yan <zi.yan@xxxxxxxx> wrote:
>> From: Zi Yan <ziy@xxxxxxxxxx>
>> 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:;;sdata=pgvzV3wv6icqkMaWY2koB9X4VqlPMaSHeB8r7%2Fv1938%3D&amp;reserved=0
> it fixes a kernel crash!

Thank you for adding the information.

Best Regards,
Yan, Zi

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