linux-kernel - Re: [PATCH v2 0/3] mm/huge_memory: vmf_insert_folio_*() and vmf_insert_pfn

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Message-ID: <948cf313-adb2-408e-a5c2-8ebc1d47cfe5@lucifer.local>
Date: Thu, 12 Jun 2025 17:30:11 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, nvdimm@...ts.linux.dev,
        linux-cxl@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
        Alistair Popple <apopple@...dia.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        Zi Yan <ziy@...dia.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
        Dev Jain <dev.jain@....com>, Dan Williams <dan.j.williams@...el.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v2 0/3] mm/huge_memory: vmf_insert_folio_*() and
 vmf_insert_pfn_pud() fixes

On Thu, Jun 12, 2025 at 06:22:32PM +0200, David Hildenbrand wrote:
> On 12.06.25 18:19, Lorenzo Stoakes wrote:
> > FWIW I did a basic build/mm self tests run locally and all looking good!
>
> Thanks! I have another series based on this series coming up ... but
> struggling to get !CONFIG_ARCH_HAS_PTE_SPECIAL tested "easily" :)

Hm which arches don't set it?

Filtering through:

arm - If !ARM_LPAE
csky
hexagon
m68k
microblaze
mips - If 32-bit or !CPU_HAS_RIXI
nios2
openrisc
um
xtensa

So the usual suspects of museum pieces and museum pieces on life-support for
some reason but also... usermode linux?

Might that be the easiest to play with?

I got this list from a basic grep for 'select ARCH_HAS_PTE_SPECIAL' so I'm not
sure if um imports some other arch's kconfig or there is some other way to set
it but probably this criteria is accurate...

IMO: criteria for arch removal (or in case of um - adjustment :) - 32-bit
(kernel), !ARCH_HAS_PTE_SPECIAL, nommu

Of course, pipe dreams...

>
> --
> Cheers,
>
> David / dhildenb
>