linux-kernel - Re: [PATCH] selftests/mm: remove PROT

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Message-ID: <2fe10966-521f-4af5-a9cd-f55d04b12eb8@redhat.com>
Date: Wed, 10 Sep 2025 11:21:05 +0200
From: David Hildenbrand <david@...hat.com>
To: Wei Yang <richard.weiyang@...il.com>, Zach O'Keefe <zokeefe@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Zi Yan <ziy@...dia.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Shuah Khan <shuah@...nel.org>, linux-mm@...ck.org,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/mm: remove PROT_EXEC req from file-collapse
 tests

On 10.09.25 11:16, Wei Yang wrote:
> On Tue, Sep 09, 2025 at 12:05:34PM -0700, Zach O'Keefe wrote:
>> As of v6.8 commit 7fbb5e188248 ("mm: remove VM_EXEC requirement for THP eligibility")
>> thp collapse no longer requires file-backed mappings be created with
>> PROT_EXEC.
>>
> 
> One question, what if user run this new version test on old kernel?
> 
> Is there a guideline for user?

We try to keep some older kernel working as long as it is easy, so 
people have to do less manual work of filtering out false positives if 
they happen to run these tests on older kernels.

6.8 was from end 2023, not sure if we still care about that.

-- 
Cheers

David / dhildenb