linux-kernel - Re: [PATCH v2 4/7] mm/selftests: Fix split_huge_page_test failure on systems with 64KB page size

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Message-ID: <e26b337d-336a-4d2b-a625-881500bd5a3a@arm.com>
Date: Thu, 3 Jul 2025 13:45:33 +0530
From: Dev Jain <dev.jain@....com>
To: Aboorva Devarajan <aboorvad@...ux.ibm.com>, akpm@...ux-foundation.org,
 Liam.Howlett@...cle.com, lorenzo.stoakes@...cle.com, shuah@...nel.org,
 pfalcato@...e.de, david@...hat.com, ziy@...dia.com,
 baolin.wang@...ux.alibaba.com, npache@...hat.com, ryan.roberts@....com,
 baohua@...nel.org
Cc: linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, donettom@...ux.ibm.com, ritesh.list@...il.com
Subject: Re: [PATCH v2 4/7] mm/selftests: Fix split_huge_page_test failure on
 systems with 64KB page size


On 03/07/25 11:36 am, Aboorva Devarajan wrote:
> From: Donet Tom <donettom@...ux.ibm.com>
>
> The split_huge_page_test fails on systems with a 64KB base page size.
> This is because the order of a 2MB huge page is different:
>
> On 64KB systems, the order is 5.
>
> On 4KB systems, it's 9.
>
> The test currently assumes a maximum huge page order of 9, which is only
> valid for 4KB base page systems. On systems with 64KB pages, attempting
> to split huge pages beyond their actual order (5) causes the test to fail.
>
> In this patch, we calculate the huge page order based on the system's base
> page size. With this change, the tests now run successfully on both 64KB
> and 4KB page size systems.
>
> Fixes: fa6c02315f745 ("mm: huge_memory: a new debugfs interface for splitting THP tests")
> Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
> Signed-off-by: Aboorva Devarajan <aboorvad@...ux.ibm.com>
> ---
>   

LGTM

Reviewed-by: Dev Jain <dev.jain@....com>